When serving a tennis ball, a player hits a ball that is considered to be stationary when it makes contact with the tennis racket.  The racket exerts an average force of 538 N on the ball for 5 milliseconds, giving the ball a final velocity of 47 m/s when it leaves the racket.   a) What is the mass of the tennis ball in grams? b) What was the ball's linear momentum in kg*m/s just as it left the surface of the tennis racket during the serve?

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