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A racket causes a tennis ball to rebound at a speed of 25 m/s The tennis ball is 0.4 kg and is initially moving at a speed of 12 m/s. A high-speed movie film determines that the racket and ball are in contact for 0.05 s. What is the average net force exerted on the ball by the racket

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leena

Hi there!

We know that:

I = Δp = mΔv = m(vf - vi)

Let the positive direction be towards the wall. Plug in the given values:

Δp = 0.4(-25 - 12) = -14.8 Ns

Δp = Ft, so:

Δp/t = F

-14.8/0.05 = -296 N (depending on which direction you assign positive/negative, the answer would be positive/negative)

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