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A ball is thrown up onto a roof, landing...

A ball is thrown up onto a roof, landing 4.50 s later at height h = 20.0 m above the release level. The ball's path just before landing is angled at `theta=60.0^(@)` with the roof. (a) Find the horizontal distance d it travels. What are the (b) magnitude and ( c) angle (relative to the horizontal) of the ball's initial velocity?

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(a) 45.7 m, (b) 28.4 m/s, ( c) `-68.9^(@)`
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