A billiard ball strikes and rebounds from the cushion of a pool table perpendicu

Question

A billiard ball strikes and rebounds from the cushion of a pool table perpendicularly. The mass of the ball is 0.38 kg. The ball approaches the cushion with a velocity of+2.10 m/s and rebounds with a velocity of -1.70 m/s. The ball remains in contact with the cushion for a time of 3.40

A billiard ball strikes and rebounds from the cushion of a pool table perpendicularly. The mass of the ball is 0.38 kg. The ball approaches the cushion with a velocity of +2.10 m/s and rebounds with a velocity of -1.70 m/s. The ball remains in contact with the cushion for a time of 3.40 times 10-3 s. What is the average net force (magnitude and direction) exerted on the ball by the cushion?

Explanation / Answer

avg force = change of momentum/time = 0.38*(-1.7-2.1)/(3.4*10^-3) = -424.7 N

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