Tennis champion Venus Williams is capable of serving a tennis ball at around 127 mph.
a)Assuming that her racquet is in contact with the 57.0-g ball for 0.250 s, what is the average force of the racquet on the ball?
b) What average force would an opponent's racquet have to exert in order to return Williams's serve at a speed of 50.0 mph, assuming that the opponent's racquet is also in contact with the ball for 0.250 s?
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