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 February 12th, 2012, 06:01 AM #1 Newbie   Joined: Feb 2012 Posts: 5 Thanks: 0 Dynamics An elastic ball is projected with speed V from a point O of a smooth plane inclined at an angle $\theta$ to the horizontal. The initial direction of projection is up the plane, makes an angle $\theta+\phi$ with the horizontal and lies in the vertical plane containing a line of greatest slope of the plane. If the ball ceases to bounce at the instant when it returns to O, show that tan$\theta$tan$\phi$= 1 - e, where e if the coefficient of restitution between the ball and the plane. Any ideas? ^^

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