A ball is bouncing elastically with a speed 1 m/s between walls of a railway compartment of size 10 m in a direction perpendicular to walls. The train is moving at a constant velocity of 10 m/s parallel to the direction of motion of the ball. As seen from the ground choose the correct optionA. the direction of motion of the ball changes every 10 secondsB. speed of ball changes every 10 secondsC. average speed of ball over any 20 seconds interval is fixedD. the acceleration of the ball is the same as from the train.

A ball is bouncing elastically with a speed 1 m/s between walls of a r

1.	A ball is bouncing elastically with a speed 1 m/s between walls of a railway compartment of size 10 m in a direction perpendicular to walls. The train is moving at a constant velocity of 10 m/s parallel to the direction of motion of the ball. As seen from the ground choose the correct optionA. the direction of motion of the ball changes every 10 secondsB. speed of ball changes every 10 secondsC. average speed of ball over any 20 seconds interval is fixedD. the acceleration of the ball is the same as from the train.
Answer» Correct Answer - B::C::D As speed is changing after travelling 10 m and speed is `1 m//s` hence, time duration of the changing speed is 10. Since, the train is moving with constant velocity hence, it will act as inertial frame of rederence as that of earth and wacceleration will be same in both frames.

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