A tennis player hits a 1.45 kg tennis ball with a racket of mass 2.5 kg. If he hits the ball with a velocity of 7.5 m/s and then stops, what impulse did he imply on the ball? What is the ballâ€™s velocity?

Here is answer:

Since, impulse=change in momentum

Change in momentum =m*(Vf-Vi) = 2.5*7.5=18.75 kg m/s

Hence impulse on ball = impulse on racket = 18.75 kg m/s

Velocity = momentum/mass = 18.75/1.45 = 12.93 m/s Ans

Regards

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