## Question:

It was observed that a tennis ball when served horizontally a distance h above the ground strikes the smooth ground at B a distance d away. Determine the initial velocity ${ v }_{ A }$ of the ball and the velocity ${ v }_{ B }$ (and θ) of the ball just after it strikes the court at B. The coefficient of restitution is e. Given: h = 7.5 ft , d = 20 ft , e = 0.7 , g = ${ 32.2ft/s }^{ 2 }$