Kinematics Questions and Answers

A person walks up a stalled escalator in 90 sec 19 When standing on the same escalator now moving he is carried up in 60 seconds How much time would it take him to walk up the moving escalator 1 36 sec 2 42 sec 3 18 sec 4 9 sec A coin is released inside a lift at a height of 2 m 20 3 5 sec 98 m s safe for yok R E DER ER PLANT 1 36 sec 3 18 sec 4 5 sec 99 m s 360 sec 90 sec gn that m 2 42 sec 4 9 sec OF

A ball leaves a horizontal table with velocity Vo 5 m s The ball bounces elastically from a vertical wall at a horizontal distance D 8 m from the table as shown in figure The ball then strikes the floor a distance x from the table g 10 m s The value of xo in meter is T 20m

The velocity time graph for a body is shown in the figure Answer the following a calculate the acceleration during the time interval 4s to 8s b find the distance covered in first 8s c time interval when moving with zero acceleration d find the retardation during the journey 4 V m s 12 0 A 4 8 12 t 16 20 t s

45 A lift is coming from 8th floor and is just about t reach 4th floor Taking ground floor as origin an positive direction upwards for all quantities whic one of the following is correct 1 x 0 v 0 a 0 2 x 0 v 0 a 0 3 x 0 v 0 a 0 4 x 0 v 0 a 0

U1 376 Trajectories of two projectiles are shown in figure Let T and T be the time periods and speeds of projection Then I a T T b T T c U U d u u and uz their

A fighter plane enters inside the enemy territory at time t 0 with velocity vo 250 ms and moves horizontally with constant acceleration a 20ms 2 see figure An enemy tank at the border spot the plane and fire shots at an angle 0 60 with the horizontal and with velocity u 600 ms At what altitude H of the plane it can be hit by the shot 1 600 ms 60 a 1500 3m D b 125 m 1400 d 2472 m

Q1 A stone is accelerated upwards by a cord whose breaking strength is three times the weight of the stone The maximum acceleration with which the stone can be moved up without breaking the cord is A 8 B 28 C 3g

30 A monkey can jump a maximum horizontal distance of 20 m Then the velocity of the monkey is a 10 ms c 20 ms b 14 ms 1 1 d 24 ms 31 A ball is projected with kinetic energy K at an angle of 45 to the horizontal At the highest point during

A man is running a race on a straight track where a wind is blowing with constant velocity perpendicular to the track in horizontal direction Just after man starts running he finds wind is blowing at an angle a 45 with the track relative velocity of wind with respect to man By the time man completes the race wind rotates THROUGH an angle 45 Man Top view of track velocity of wind with respect to man A During the race man is slowing down B During the race man is speeding up C Man stops just at the finish line D Man crosses the finish line running

0 A person standing on the floor of an elevator 10 drops a coin The coin reaches the floor in time t if the elevator is at rest and in time t if the elevator is moving uniformly Then 1 t t or t t depending upon whether the lift is going up or down 2 1 1 3 1 1 4 t t fefe fer foran f farve faze se af fer fetter at garanta 1 1 1 3 for an 2 1 1 3 1 4 L fante a for f sate

of 10 m s in a direction 45 from the horizontal y direction on the smooth inclined plane Calculate the magnitude v of its velocity in m s after 2 seconds Take g 10 m s 10m s 45 y 45 X

The figure shows the velocity and acceleration of a point like body at the initial moment of its motion The acceleration remains constant Given a 10 m s vo 30 m s 0 127 a A Speed will be minimum at t 1 8 sec B Speed will be minimum at t 5 sec Speed will be minimum when C acceleration velocity are perpendicular to each other D Minimum speed will be zero 0

A particle moves with constant speed v along a parabolic path y kx Where k is a positive constant Which of the following is are correct A x component of velocity at origin is zero B y component of velocity at origin is zero C Acceleration of particle at origin is 2kv D Acceleration of particle at origin is zero

b who le to a 20 volt potential The and pure 40 mH coil is so that LC oscillations are e coil is JEE Main Online 2018 10 mA 4A tal wire are lying on a oop A carries a current e the loop B 1999 UPSEAT 2003 05 H The current region a Is zero b Decreases as c Increases as r d Decreases as 1 r 1 2 X X X X Y X le centre of the cir IIT JEE Screening 2 X X B t X X X 2 Xx X XX Pens loops se closed a clockwise an induced current closed for a long ti flows in Q Then th E are A coil of wire having finite inductance and resistance ha conducting ring placed coaxially within it The col connected to a battery at time t 0 so that a time depende current starts flowing through the coil If It is s current induced in the ring and B t is the magnetic field a the axis of the coil due to 1 t then as a function of t 0 the product 1 t B t IIT JEE Screening 2000 a Increases with time b Decreases with time c Does not vary with time d Passes through a maximum 1 Two circular coils can be arranged in any of the three situations shown in the figure Their mutual inductance will be IIT JEE Screening 2001 Batter a Respectiv b Both cloc c Both ant d Respect

A particle is projected up on incline at t 0 with speed 14 m s as shown in the figure At the same moment a box starts sliding down the box has 2 small hole at height of 2m on opposite walls The particle enters from 1st window and leaves through the other The width of the box is Assume friction to be absent everywhere 14m s 2m 1302 153 2m

The extension load graph for a spring is shown The unstretched length of the spring is 17 0cm A extension cm 1 4 N 3 2 1 0 0 1 N C 2 6N 2 When an object is suspended from the spring the length of the spring is 19 2 cm What is the weight of the object B 1 6 N 3 load N D 3 0N

constant velocities along X axis at time t seperation between both is 20 m Take usu sign convention Choose correct graph position of A with respect to B AB vs time 6m s 4m s A B C A 0 0 0 20 m r TAB TAB A B A B 10 10 10 B t t

SI TO A particle moves along a straight line OX At a 3 time t in second displacement of the particle from O is given by x 40 12t t How long would the particle travel before coming to rest 1 24 m 2 40 m 3 36 m 4 16 m The position x of a particle with respect to time t X 1441 x 40 121 FITH STRUTH T H Th i i en 1 24m 2 40 m 3 36 m 4 16 m faika za

2 3 1 6 5 7 1 1 0 A Rotating earth b trees c wall d ground Velocity is a Distance time b displacement time c force velocity d distance velocity Acceleration is a Change in velocity time b change in position time c motion distance d force velocity What type of motion is described by a stone which moves in a circular path with constant speed a Uniform circular motion b motion c velocity change d distance covered Which is solid a Air b water c milk d Gold Which is rgid a Air b water c milk d Gold Which can be flow A chalk b chair c milk d Gold What are weeds What is intercropping What is cron rotation 1 1 1 1 fund 1 alab 1 1

maximum speed with which a person can swim in the still water He intends to cross the river by shortest possible path i e he wants to reach the point on the opposite bank which is directly opposite to the starting point Which of the following is correct A He should start normal to the river bank He should start in such a way that he B moves normal to the bank relative to the river He should start in a particular calculated C direction making an obtuse angle with the direction of water current D The man cannot cross the river in that way

R 7 Two buildings are separated by 30 m By what 17 speed a ball is projected horizontally from a window at height 150 m in one building so as to enter in the window at height 27 5 m in the other building 1 2 m s 3 4 m s 2 6 m s 4 8 m s EADER TEST SERIES JOINT PACKAGE COURSE R 30 gra 150 m fra forset fed f tan and for sa del 27 5 m fra fors 1 2 m s 3 4 m s 2 6 m s 4 8 m s 0999DMD310320002

Drops of a liquid are falling from the top of a 8 building of height 20 m at regular interval such that when 1st drop reaches the ground third is about to fall then find the time interval between them second 2 1 second 3 2 second min second 20m fit for ve fufa del af at 2 at de fron aus 3 2 v 2 1 v 4

ALLEN 11 Velocity time graph of a particle undergoing 11 farm to h rectilinear motion is plotted upto T t as shown in the figure Average acceleration of the particle is zero in time interval 1 0 and t 3 and t VA 15 10 5 N 1 4 2 1 and t 4 and t sted i V 15 10 1 Ot 3 of M 1 4 4 2 1 1 4 5 1

5 On a moving vehicle you want to drop a ball into a drown circle on road such that it remains there even after few bounces When should you throw the ball aiga uz i ct 34 CRE ARHIA H ch Uz ych d gy m a RAT HO COM 241 dig Hit ast Ball Velocity Launch Point Vehicle Velocity

7 A 2 000 kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails with magnitude of 6 000 N directed toward the northwest 45 N of W What is the direction of the resultant acceleration a 60 N of E b 30 N of W c 30 N of E d 74 N of W

The motion of a body falling from rest in a medium dv dt is given by equation any time t is 1 1 e 3 1 e 1 2v The velocity at da 2 1 e t 4 1 8 2 bruo

Question 13 V g k on block B is A Block A is in equilibrium Now block A given velocity m in downward direction Maximum normal reaction B 3 mg 4 mg M M 3 00 3mg m A lllllll 88 min 33 sec 2m B N M 1 00 My Answer Correct Answer

5 A cylinder is placed on a horizontal surface A particle is projected with speed u and it crosses the cylinder by just touching at two points as shown in figure If the intial speed with which the mass is projected is 5xm s then the value of x is UA 60 R 0 6m

19 Two projectiles are projected at angles 0 4 T e with the horizontal where 0 4 4 1 tan 0 1 2 1 tan 0 3 1 1 4 1 3 0 and 3 with same speed The ratio of horizontal ranges described by them is

Choose 1 A particle at rest can be accelerated 2 A uniformly accelerated motion can revert its velocity 3 In a straight line motion a particle can revert its acceleration without reverting it s velocity 4 All of these

A particle is projected from the ground at t 0 so that on its way it just clears two vertical walls of equal height on the ground The particle was projected with initial velocity u and at angle with the horizontal If the particle passes just grazing top of the wall at time t t and t t then calculate a the height of the wall b the time t and t in terms of height of the wall

linder is placed on a horizontal surface particle is projected with speed u and it ses the cylinder by just touching at two points as shown in figure Then the intial peed with which the mass projected 6 5xm s The value of x is 60 R 0 6m

9 A passenger train of length 60 m travels at a speed of 80 km hr Another freight train of length 120 m travels at a speed of 30 km h The ratio of times taken by the passenger train to completely cross the freight train when i they are moving in same direction and ii in the opposite directions is S 25 a b c 3 d

A person climbs up a stalled escalator in 60 s standing on the same but escalator running with constant velocity he takes 40 s How much time is taken by the person to walk up the moving escalator a 37s b 27s c 24 s d 45 s

velocity vector and perpendicular to each other is equal to 1 1 sec 2 2 sec 3 1 5 sec 4 5 sec At any instant of time acceleration and velocity of a particle are given by j v 6 8 then rate of change of speed at the same instant will be 3 4 25 3 3 8 1 2 61 81 25 4 31 4

A rubber ball is released from a height of 5 m mathongo mathongo above the floor It bounces back repeatedly mathongo mathongo mathongo mathongo mathongo mathongo mathongo mathongo mathongo mathongo 81 always rising to of the height through 100 mathongo maunongo mathongo mathongo mathongo mathongo which it falls Find the average speed of the ball mathongo mathongo mathongo mathongo mathongo mathongo Take g 10 ms 2 Wmathongo w mathongo mathongo mathongo mathongo mathongo 1 3 0 ms 1 mathongo mathongo mathongo mathongo mathongo mathongo mathongo 4 2 50 ms 1 mathongo mathongo mathongo mathongo mathongo mathongo 2 3 50 ms 3 2 0 ms 14 mathongo mathongo mathongo

The motion of a body of mass 2 kg is depicted graphically as shown in the given figure then the magnitude of net force acting on the body is A zero C 20 N B 2 N D 0 5 N Distance m 20 10

kinetic energy 4 mu of the molecules p is not always equal to p The average of a squared quantity is not necessar the square of the average Can you find examples for this statement

A ball is fired perpendicularly from an inclined plane towards another plane as shown If it also strikes the second plane perpendicularly Find i Time of flight ii Velocity iii Displacement AB Pe 253 sec 10 3 m sec A 90 60 10 3 m sec A 90 60 Glamone 30 B 30 B Ved JE D Vede JE

A train is moving at a constant speed along a straight level track Then a the frictional force is zero b the resultant of all the forces acting on the train is zero c the pushing force is greater than the frictional force d the frictional force on the engine and the coach acts in the same direction

Two identical particles P and Q of rest mass m are moving with velocities 5c 2c and 19 5 in directions x and r respectively in the lab frame Calculate the energy of particle P in Q s rest frame b c 21654772E m c m c d m c

Two boats were going down stream with different velocities When one overtook the other a plastic ball was dropped from one of the boats Some time later both boats turned back simultaneously went at the same speeds as before relative to the water towards the spot where the ball had been dropped Which boat will reach the ball first Q 1 the boat which has greater velocity relative to water 2 the boat which has lesser velocity relative to water 3 both will reach the ball simultaneously 4 cannot be decided unless we know the actual values of the velocities and the time after which they turned around

1 36 Two steel balls fall freely on an elastic slab The first ball is dropped from a height h and the second from a height h h h T sec after the first ball After the passage of time T the velocities of the balls coincide in magnitude and direction Determine the time I and the time interval during which the velocities of the two balls will be equal assuming that the balls do not collide

A motorboat can maintain a constant speed of 22 miles per hour relative to the water The boat makes a trip upstream to a certain point in 27 minutes the return trip takes 17 minutes What is the speed of the current The speed of the current is mile s per hour

Solution Take the block as the system The force on it are the figure Find the tension in the string a point i B lower end ii A mid point a Pull of the string T upward b Pull of the earth Mg downward T Ma 0 T Mg T A B M E M

A particles moves along a coordinate axis in the positive direction to the right Its position is given by s t t 2 t 8 a Determine the direction the particle is traveling when s t 0 b Determine the direction the particle is traveling when a t 0 c Determine the intervals when the particle is speeding up or slowing down

8 The instantaneous velocity v of a particle starting with the initial velocity vo and moving with uniform acceleration after time t is give be v vo at Prove by integration that the displacement x at that particular instant from an arbitrary origin is x xo vot 1 2 at

An airplane is in supersonic flight at an altitude h At what smallest distance a along the horizontal from the observer on the ground is there a point from which the sound emitted by the airplane motors reaches to the observer earlier than sound emitted by plane when it is at point A that is directly above the observer Up velocity of airplane Us velocity of sound S a Question Type Single Correct Type A h O

Assertion A Interference obeys the law of conservation energy Reason R The energy is redistributed in case of interference 1 Both Assertion and Reason are true and the Reason is the corre explanation of the Assertion 2 Both Assertion and Reason are true but the Reason is not corre explanation of the Assertion 3 Assertion is true but Reason is false 4 Assertion is false and Reason is tr

A particle is projected with some speed at an angle of 60 with horizontal and simultaneously a bee starts following the path of particle with san constant speed The list I below gives some quantities involved for the particle and list ll gives some possible values 45 List l 0 Acceleration at highest point of trajectory 11 Magnitude of rate of change of speed at point A 111 Centripetal acceleration at point A IV Centripetal acceleration at highest point Correct match for particle projected is I RIIS III S IV Q I QIP IIS IVQ IRIS III S IVR I QIP III QIV S 4 u 60 P 0 R s T U List II 3 g 2 0 g 2 4g 2g