Kinematics Questions and Answers

A V 3 A river is flowing with speed V When the swimmer is swimming upstream then his speed is 2V with respect to earth Find out the speed of the swimmer if he starts swimming downstream with same speed with respect to river A 4V B 3V C 2V D None instream and he travels L distance with respect to earth came speed with ith

190 In the given diagram shown for a projectile what is the angle of projection 10y4 VA 1 tan 1 3 tan 1 4 3 D Dela al nozieq A pos on to boited or br p nt leups al 20 m 30 m 18 10m 5 al ekinsq ed 2 tan X w 180d a wo is evoll 4 tan 813 12878 WoT NEM A 802 5 3

76 A man wants to cross a river 600 m wide flowing at 8 m s in shortest time Man has a speed of 6 m s in still water What is the path length covered by man in the river 154 1 Infinite Rp binne 3 100 m 2 1 km 1 4 1000 cm

153 Two stones are thrown simultaneously from the top of a building horizontally but in opposite directions they will be moving perpendicular to each other initial say after time t then t is equal to speed of stones are u and u respectively and acceleration due to gravity is g 1 3 U U g 4142 2 2 4 U 4 V g 20142 2 a

3 127 A body A is projected vertically upwards Another body B of same mass is projected at an angle of 60 with the horizontal If both the bodies attain same maximum height then ratio of initial kinetic energy of body A to that of body B is 3 1 E 4 X 1 3 To ei led ort 2 4 3 2 1 2 mag2 2 Imvz Hoa A ist 280

An observer is moving with constant towards a fixed source of sound As per Doppler s effect the variation of frequency fobserved with time t is best represented by 1 3 F f 2 4 P

30 A boy runs on a circular track of radius R in km 27 C TR 2 and then R km h in anticlockwise sense for 1 h The magnitude of his displacement will be nish with speed of om s bra km h in clockwise sense for 3 h TR 2 nivit encloones as moit er yd 3rR mod arth to 3 1 R 2 2 begooib ai dmod A 25 Mainosher 4 2R 8

0 A particle is projected from the origin with velocity 41 91 m s The acceleration in the region is constant and 10 m s The magnitude of CWT Cor velocity after one second is TO D 1 8 m s 2 15 m s 3 17 m s 4 27 m s w 11s att adt b du vd nevis ierit to sebutingem

20 A particle is thrown from ground with a speed 20 m s at an angle 60 above horizontal Average velocity over its entire journey just before hitting the ground is 1 10 m s 3 Zero 2 20 m s 7 4 15 m s

140 A body of mass 2 kg is projected at a speed of 20 m s from a pillar of height 40 m at an angle of 30 with the horizontal in upward direction Speed with which it will hit the ground is 2 20 3 m s 4 40 m s BUCO 1 30 m s nsini 3 25 m s

A person aiming to reach exactly opposite point on the bank of river is swimming at speed of 6 km h at an angle of 150 with the direction of flow of water The speed of water in stream is 5 2 km h 1 4 6 km h 1 3 km h 1 STIME 2 km h 1

7 A particle moving towards east with a velocity of 20 m s In 20 s it changes its velocity to 60 north of east its average acceleration will be 2 2 m s 4 0 5 m s 1 3 m s 3 1 m s

18 A projectile thrown with initial velocity 20 m s at an angle 60 with horizontal then angle of velocity of projectile with horizontal after time 0 732 s is 1 45 2 30 3 0 4 15

A super ball is to bounce elastically back and forth between two rigid walls at a distance d from each other Neglecting gravity and assuming the velocity of super ball to be v horizontally the average force being exerted by the super ball on each wall is 1 mv 8 2 d 2mv 1 4 mv 0 d 4mv

A bus is running along a highway at a speed of 20 m s A man is at a distance of 100 m from the highway and 400 m from the bus at an instant Find the minimum speed of running in m s so that the man could catch the bus

Two forces in the ratio 1 2 act simultaneously on a particle The resul these forces is three times the first force The angle between two ford 0 60 45 90

f A and are two vectors given by A 21 31 and B 1 1 then magnitude of A B is C 5 5 5

Two stones are thrown vertically up simultaneously from the top of a tower of height 200 m with speeds 30 m s and 15 m s at t 0 The time variation of relative position of first stone with respect to the second is a straight line till the time t to seconds Find the value of to

15 60 8 ms 1 The distance x along x axis and height y for a body projected in x y plane are given as x 6t and y 8t 3t The initial speed of projection is x y in meter 14 m s 1 12 ms 1 Mark Tor Review 10 ms 1 59 min

4 A projectile is projected with speed vo at angle 0 from the horizontal ground The radius of curvature of the projectile is maximum at 1 Highest point 2 Between point of projection and highest point 3 Between highest point and point of landing 4 Point of projection

If 21 31 k and B 41 aj 2k are parallel to each other then value of a can be Question Type Single Correct Type 1 2 3 4 6 6 1 5 1 5

In the given figure the coefficient of friction between block and incline is u If the block slides on inclined with constant velocity the friction acting on block will be A u mg sin0 B u mg tan 0 m C mg sin 0 D mg cos 0

Phy Section A This section contains 35 SINGLE CORRECT TYPF questions Each question has 4 Read More A bulb is first connected across a 10 V DC supply and then a 20 V DC supply The ratio of power dissipated in the two cases will be resistance is constant 01 2 01 4 02 3

A uniform rod of mass m and length l is suspended horizontally by the means of two vertical light inextensible strings at the ends c rod Tension in one string immediately after the other string is cut is

Rain is falling vertically with a speed of 4 ms After some time wind starts blowing with a speed of 3 mx in the north to south direction In order to protect himself from rain a man standing on the ground should hold his umbrella at an angle 0 given by A 0 tan C 0 cot with the vertical towards south with the vertical towards south B 0 tan D 8 cot www with the vertical towards north with the vertical towards north

A ball is dropped from a height of 20m and rebounds with a velocity which is 3 4th of the velocity with which it hits the ground What is the time interval between the first and second bounces g 10m s2 A 3 sec B 4 sec C 5 sec D 6 sec

A particle is travelling along a straight line OX The distance x in metre of the particle from O at a time t is given by 21 36t 3t where t is time in second The distance of the particle from O when it comes to rest is A 72 m B 69 m C 53 m DY 21 m 11

A point moves along a circle with velocity v at where a 0 5 m sec Then the total acceleration of the point at the moment when it covered 1 10 th of the circle after beginning of motion A 0 5 m sec C 0 7 m sec B 0 6 m sec2 D 0 8 m sec

A truck is traveling south at a speed of 53 km h toward an intersection A car is traveling east toward the intersection at a speed of 60 km h What is the velocity of the car relative to the truck A 7 km h B 113 km h C 80 km h D 28 km h

1 A man of mass M stands at one end of a plank of length L which lies at rest on a frictionless surface The man walks to other end of the plank If the mass M 3 moves relative to ground is 3L 4 4L of the plank is 4 then the distance that the man 2 4 L

9 A billiards player hits a stationary ball by an identical ball to pocket the target ball in a comer pocket that is at an angle of 40 with respect to the direction of motion of first ball Assuming the collision as elastic and friction and rotational motion are not important the angle made by the target ball with respect to the incoming ball is 1 40 2 50 3 45 4 60

A stone of mass m falls from the top of a tower of height 150 m The stone s position y measured down from the top of the tower where y 0 as a function of time t is given as mg y t k m g k 1 e kt m where g is the gravitational acceleration and k is the air resistance coefficient Assuming that m 0 5 kg g 9 81 m s and k 0 01 kg m find numerically the time required for the stone to hit the ground Achieve an accuracy of six decimal places

A projectile is thrown with velocity v making an angle 0 with the horizontal It just crosses the tops of two poles each of height h after 1 second and 3 second respectively The time of flight of the projectile is A 1 s B 3 s D 7 8 s C 4 s

28 A wedge of mass M 2 m rests on a smooth horizontal plane A small block of mass mo rests over it at left end A as shown in figure A sharp impulse is applied on the block due to which it starts moving to the right with velocity v 6 m s At highest point of its trajectory the block collides with a particle of same mass mo moving vertically downwards with velocity v 2 m s and gets stuck with it If the combined mass lands at the end point A of the body of mass M the length is cm Neglect friction take g 10 m s B 1 0 20 cm

A rocket is fired upwards Its engine explodes fully in 12 second The height reached by the rocket as calculated from its velocity time graph is A 1200 x 66 m B 1200 x 132 m 1200 C 12 D 1200 x 122 m m 1200 v ms 12 t in second 132 98

A boat is moving with a velocity 5kmph relative to water And water in a river is flowing with a velocity 3kmph The ratio of times taken by boat to cover same distance in downstream and upstream is A 4 1 B 1 4 C 5 3 D 3 5

are projected horizontally with same speed v as shown in figure At the time when 2 touches ground at co ordinate L 1 m q h h m q 2 time elapsed T V x coordinate of 1 L x axis y coordinate of particle 1 is h h gL V2

A river is flowing from west to east at a speed of 8 m s A man on the north bank of the river capable of swimming at 16m s in still water wants to swim across the river in shortest time He should swim in a direction A Due south B Due north

particle of mass m moves along a circle of radius r with constant tangential accelerati kinetic energy E of the particle becomes three times by the end of third revolution a eginning of the magnitude of tangential acceleration is celeration E 6 rm B C A E 12 rm E 24 rm E 3 rm D eef

A car of mass m is driven with acceleration a along a straight level road against a constant external resistive force R When the velocity of the car is V the rate at which the engine of the car is doing work will be fed ER five V A RV B ma V a C R ma V D ma R V

The displacement of an object attached to a spring and executing simple harmonic motion is given by X 2 10 Cos t metres The time at which the maximum speed first occurs is AIEEE 2007 1 0 5 s 2 0 75 s 3 0 125 s 4 0 25 s the law y Y cos mt T 4 If the acceleration of the particle is

A girl running on ground observes rain to be falling at a speed 10 m s The rain is falling vertically downward at a speed 6 m s with respect to girl when she was at rest The speed of the girl is 1 4 m s low 28 m s 3 2 m s 4 1 m s

The position vector of a particle from origin is given by F A cosat jsinot The motion of the particle is 1 simple harmonic Ob 3 on a circle 2 on a straight line 3 4 with constant acceleration atents and in successive order The time periods of

Two skates A and B of weights 40 kg wt and 60 kg wt respectively are facin each other 5 m apart Then they pull a light rope stretched between them Assuming surface to be smooth They will meet at a distance of O 3 m from A 2 m from A 2 5 m from A O 3 5 m from A

A charged particle of charge q and mass m is released from state of rest in an electric field of constant magnitude E The KE gained by particle after t seconds is q Et 2m 2E 2 q m E 212 2m

A body of mass m collides elastically with another body of mass m at rest If the velocity of m after collision becomes 2 3 times its initial velocity the ratio of their masses is AIIMS 2018 1 1 5 2 5 1 3 5 2 4 2 5 veloci

A ball is thrown vertically downwards from a height of 20 m with an initial velocity v It collides with the ground loses 50 of its energy in collision and rebounds to the same height The initial velocity v is Take g 10 m s INEET 2015 1 28 ms 2 10 ms 3 14 ms 4 20 ms

6 What should be the value of distance d so that final image is formed on the object itself focal lengths of the lenses are written on the lenses 1 10 cm 2 20 cm 10cm 10cm 3 5 cm 20cm 4 none of these onuar lens of focal length 10 cm The obiect is

A hiker stands on the edge of a cliff 490 m above the ground and throws a stone horizontally with a speed of 15 m s1 The time taken by the stone to reach the ground is Question Type Single Correct Type 1 2 3 5 s 10 s 12 s

06 Of the following situations which one is impossible O A A body having constant velocity and variable acceleration O B A body having velocity along the eastern direction and the acceleration in the westem directio C Abody having zero velocity and non zero acceleration O D A body having constant acceleration and variable velocity