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Tennis champion Maria Sharapova is capable of serving a tennis ball at 126 mph. b) What...

Tennis champion Maria Sharapova is capable of serving a tennis ball at 126 mph.

b) What average force would an opponent's racquet have to exert in order to return her 126-mph serve at a speed of 55.9 mph, assuming that the opponent's racquet is also in contact with the ball for 0.277 s.

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