Q 1851167924.     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.

NCERT Exemplar 02/11/MCQ

(This question may have multiple correct answers)

A The direction of motion of the ball changes every 10
B Speed of ball changes every 1 0
C Average speed of ball over any 20 interval is fixed
D The acceleration of ball is the same as from the train

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