It was observed that a tennis ball when served
Chapter 15, Problem 15-71(choose chapter or problem)
It was observed that a tennis ball when served horizontally 7.5 ft above the ground strikes the smooth ground at B 20 ft away. Determine the initial velocity vA of the ball and the velocity vB (and u) of the ball just after it strikes the court at B. Take e = 0.7.
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