20 Q 4 1 A cart on a roller coaster rolls down the track

Last updated: 6/13/2023

20 Q 4 1 A cart on a roller coaster rolls down the track shown below As the cart rolls beyond the point shown what happens to the components of the velocity and acceleration in the direction cart 1 Velocity increases continuously acceleration first increases then decreases 2 Velocity first increases then decreases acceleration decreases continuously 3 Velocity first increases then decreases acceleration increases continuously 4 Velocity increases continuously acceleration decreases continuously Two planes are flying at the same speed 200 m sec in opposite directions A machine gun mounted in one plane fired bullets at the other at right angles to their line of flight see figure How far apart approximately will the bullet holes made in the side of the second plane be if the machine gun fires 900 bullets per minute 3 1 13 m 2 27 m 3 39 m 4 54 m A particle of mass m enters a regi horizontally at time t 0 with speed midway between two plates that a separated by a distance h as shown in t figure The particle is acted on by bo gravity and by a time varying force th points upward and has magnitude F where b is a positive constant that sufficiently large such that the particle h the top plates without ever touching t bottom plate How long does it take for t particle to reach its lowest point Js 1 3 mg b 2mg b h 2 mg 2b 4 2mgb