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A man stands on the roof of a 20.0-m-tall building and throws a rock with a speed of 35.0 m/s at an angle of 40.0

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A man stands on the roof of a 20.0-m-tall building and throws a rock with a speed of 35.0 m/s at an angle of 40.0" above the horizontal. Ignore air resistance. Calculate a. the maximum height above the roof that the rock reaches; b. the speed and direction of the rock just before it strikes the ground

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