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February 12th, 2012, 06:01 AM   #1
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An elastic ball is projected with speed V from a point O of a smooth plane inclined at an angle to the horizontal. The initial direction of projection is up the plane, makes an angle 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 tantan= 1 - e, where e if the coefficient of restitution between the ball and the plane.

Any ideas? ^^
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