the answer is on this website:
www.quora.com/A-tennis-player-serves-with-a-speed-of-30m-s-The-ball-leaves-the-racquet-at-a-height-of-2-5m-and-a-horizontal-distance-of-12-25m-from-the-net-The-height-of-the-net-is-0-91m-If-the-ball-leaves-the-racquet
A tennis player serves a ball with a speed of 30m/s.The ball leaves the racquet at a height of 2.5 and a horizontal distance of 12.25m from the net.The height of the net is 0.91m
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