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In the figure here, a ball is thrown up onto a roof, landing 4.90 s later at height h 21.0 m above the release level. The ball's path just
before landing is angled at 0 = 57.0° with the roof. (a) Find the horizontal distance d it travels. (Hint: One way is to reverse the motion,
as if it is on a video.) What are the (b) magnitude and (c) angle (relative to the horizontal) of the ball's initial velocity?
0000
D000

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