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A ball moving vertically downward with a...

A ball moving vertically downward with a speed of `10 m//s` collides with a platform. The platform moves with a velocity of `5 m//s` in downward direction. If `e = 0.8`, find the speed (in `m//s` ) of the ball just after collision.

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The correct Answer is:
`1 m//s`

By definition of `e : e = (v_(2) - v_(1))/(u_(1) - u_(2))`, we have `0.8 = ( V + 5)/(10 - 5) rArr v = 1 m//s`
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