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A ball is projected from the ground with...

A ball is projected from the ground with speed u at an angle `alpha` with horizontal. It collides with a wall at some distance from the point of projection and returns on the same level. Coefficient of restitution between the ball and the wall is e, then time taken in path AB and maximum height attained by the ball is

A

`( a )/(eu cos alpha) , ( u^(2) sin^(2) alpha)/( 2g)`

B

`(a)/( u cos alpha ), ( u^(2) sin ^(2) alpha)/( 2g)`

C

`( a )/( eu cos alpha), ( u^(2) sin^(2) alpha)/( 2g)`

D

`( a)/( u cos alpha) , ( u^(2) sin^(2) alpha)/( 2g)`

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The correct Answer is:
A
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