A playground is on the flat roof of a city school, 6.5 m above the street...

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Physics

A playground is on the flat roof of a city school, 6.5 m abovethe street below (see figure). The vertical wall of the building ish = 7.80 m high, forming a 1.3-m-high railing around theplayground. A ball has fallen to the street below, and a passerbyreturns it by launching it at an angle of Î¸ = 53.0Â° above thehorizontal at a point d = 24.0 m from the base of the buildingwall. The ball takes 2.20 s to reach a point vertically above thewall. (a) Find the speed at which the ball was launched. (Give youranswer to two decimal places to reduce rounding errors in laterparts.) m/s (b) Find the vertical distance by which the ball clearsthe wall. m (c) Find the horizontal distance from the wall to thepoint on the roof where the ball lands.

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3.8 Ratings (418 Votes)

Part A In horizontal motion range of projectile is given by R V0xt V0x Initial horizontal speed V0cos A A launching angle 530 deg at t 220 sec R 240 m So 240 V0cos 530 deg220 sec V0 240220cos 53 deg V0 1813 msec Initial launching speed Part B At this time height of See Answer

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