Ball moving in a Train!

A ball is bouncing elastically with a speed of \(1ms^{-1}\) between walls of a railway compartment of size \(10m\) in a direction perpendicular to walls. The train is moving at a constant velocity of \(10ms^{-1}\) parallel to the direction of motion of the ball. As seen from the ground

\((A)\) The direction of motion of the ball changes every \(10\) seconds.

\((B)\) Speed of ball changes every \(10\) seconds.

\((C)\) Average speed of ball over any \(20\) second interval is fixed.

\((D)\) The acceleration of ball is the same when observed either from ground or train.


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