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A block is given a very brief push up a 20.0� frictionless incline to give it...

A block is given a very brief push up a 20.0� frictionless incline to give it an initial speed of 12.0 m/s.
(a) How far along the surface of the plane does the block slide before coming to rest?
(b) How much time does it take to return to its starting position?
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