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 -2.00 m/s. The ball remains in contact with the cushion for a time of 3.10 × 10-3 s. What is the average net force (magnitude and direction) exerted on the ball by the cushion?
F•Δt=Δp=p2-p1=mv2-mv1=m(v2-v1),
F=m(v2-v1)/Δt =
=0.38[2.1-(-2)]/3.1•10⁻³=502.58 N.
11.5
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 +2.1 m/s and rebounds with a velocity of -
2.0 m/s. The ball remains in contact with the cushion for a time of 3.3 x 10-3
s. What is the average net
force (magnitude and direction) exerted on the ball by the cushion?

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