Posted by Fatima on .
A 95 g tennis ball is traveling at 106 km/h when it bounces of a wall and travels in the opposite direction it came from at a speed of 88 km/h.
a. Determine the impulse on the ball if the. (donâ€™t forget that it is a vector)
b. If the average force exerted on the ball by the wall is 450 N, determine the time the ball stayed in contact with the wall.

physics 
drwls,
a) Momentum change = (0.095)(106 + 88)
= 18.43 kg m/s
b) F*t = impulse = momentum change
Solve for t.