A ball is bouncing elastically with a speed 
between walls of a railway compartment of
size 10 m in a direction perpendicular to walls. The train is moying at a constant velocity of 
parallel to the direction of motion of the ball. As seen from the ground:
Text Solution
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(b, c, d) In this problem, we have to keep in mind the frame of the observer. Here we must be
clear that we are considering the motion from the ground. Compared to velocity of train ( 
) speed of ball is less 
.
As speed is changing after traveling 10 m and speed is 1 
hence, time duration of the changing speed is 10s .
The speed of the ball before collision with front side of train is 
.
Speed after collision with side of train 
.
Speed of ball changes from 
in forward direction after every 10s and again back to 
in forward direction after another 10s .
In 20s, the ball repeats its behaviour again, so the average speed will be same in every 20s.
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