IMPULSE AND AVERAGE FORCE

Question 1

A 0.055kg tennis ball moving to the right with speed of 10 m/s is struck by a tennis racket causing it to move with a speed of 15 m/s in the opposite direction. If the ball remains in contact with the racket for 0.04 seconds, what is the magnitude of the average force experienced by the ball?

Answer 1

Favet=m(vf−vi)
Fave(0.04s)=0.055kg(-15m/s-10m/s)

Fave(0.04s)=0.055kg(-25m/s)
(0.04s) (0.04s)

Fave=-1.375 kg m/s / 0.04s

Fave= -34.375 kg m/s or -34.375N