A ball is released from rest above a horizontal surface. The graph shows the variation with time of its velocity. Areas X and Y are equal. This is because
1 )
the ball’s acceleration is the same during its upward and downward motion.
2 )
the speed at which the ball leaves the surface after an impact is equal to the speed at which it returns to the surface for the next impact.
3 )
for one impact, the speed at which the ball hits the surface equals the speed at which it leaves the surface.
the ball rises and falls through the same distance between impacts.
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