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A ball after falling a distance collides...

A ball after falling a distance collides an inclined plane of inclination `theta`. If after the collision , the ball moves horizontally , find the coefficient of restitution.

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After the collision , resultant of `ev cos theta` and `v sin theta` is along the horizontal direction.
`tan theta = (e v cos theta)/( v sin theta) rArr e = tan^(2) theta`
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