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Q.

A ball is thrown vertically upward under the influence of gravity. Suppose observer A films this motion and play the tape backwards (so the tape begins with the ball at its highest point and ends with  reaching the point from which it was projected), and another observer B observes the motion of the ball from a frame of reference moving at constant velocity which is equal to the initial velocity of the ball. The ball has a downward acceleration according to observer.

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a

A and B

b

Only A

c

only B

d

neither 

answer is A.

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Detailed Solution

Acceleration of the ball relative to A is (-g). Since B is moving with uniform velocity,it is inertial frame and acceleration of the ball relative to B is aiso (-g). 

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