# physics

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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. (don’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 -

a) Momentum change = (0.095)(106 + 88)
= 18.43 kg m/s

b) F*t = impulse = momentum change
Solve for t.

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