$A$ steel ball is released from rest a distance above a rigid horizontal surface and bounces several times. The diagram shows how its velocity varies with time. Which statement correctly explains why the areas $X$ and $Y$ are equal?

  • A
    The ball's acceleration is not same during its upward and downward motion.
  • B
    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.
  • C
    For one impact,the speed at which the ball hits the surface equals the speed at which it leaves the surface.
  • D
    The ball rises and falls through the same distance between the impact $1$ and $2$.

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