Coco Gauff is looking to return a tennis serve with a well executed forehand stroke.  The tennis ball is served by her opponent Aryna Sabalenka and when the served ball from Aryna reaches Coco it is traveling at 173 km/hr.  The mass of the tennis ball is 0.056 kg, the mass of the tennis racket is 0.3 kg and the coefficient of restitution between the racket and tennis ball is 0.43.  When Coco's racket makes contact with the traveling tennis ball, the racket has a velocity of 18 m/s. a) What is the magnitude of the tennis ball's velocity in m/s immediately after it leaves Coco's racket in returning the serve? Answer for part 1 m/s  b) What is the magnitude of the ball's returned velocity from part a) in km/hr? c) What is the magnitude of the ball's returned velocity from part a) in miles/hr?

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