353_Dynamics 11ed Manual

353_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 15 v A t v By1 v B2 θ Find v A t , v By1 , v B2 , , () = v A 29.30 ft s = v B2 33.10 ft s = 27.70 deg = Problem 15-74 The tennis ball is struck with a horizontal velocity v A , strikes the smooth ground at B , and bounces upward at = 1 . Determine the initial velocity v A , the final velocity v B , and the coefficient of restitution between the ball and the ground. Given: h 7.5 ft = d 20 ft = 1 30 deg = g 32.2 ft s 2 = Solution: θθ 1 = Guesses v A 1 ft s = t 1s = v By1 1 ft s = v B2 1 ft s = e 0.5 = Given h 1 2 gt 2 = dv A t = v By1 = ev By1 v B2 sin = v A v B2 cos
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