Question: During a tennis training session, a person practices her swing by hitting a ball with a tennis racket, making it such that each hit sends

During a tennis training session, a person practices her swing by hitting a ball with a tennis racket, making it such that each hit sends the ball at a launch angle of θ=32.68°. The distance to the wall is d=12.72 m, and it strikes the wall with the speed that is a fraction f=0.939 of the initial speed, while it is still gaining height (i.e., it has not the highest point of the trajectory). What is the initial velocity? Express your answer in m/s.

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