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A tennis ball with a mass of 150 g is initially travelling at 15 m/s [E] when it is struck by a racket. The ball

A tennis ball with a mass of 150 g is initially travelling at 15 m/s [E] when it is struck by a racket. The ball now is moving at 20 m/s [W]. If the time of contact between the racket and ball is 0.01 seconds then what is the force exerted by the racket

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