A billiard ball approaches a side cushion at a 45deg angle, Ask an Expert

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A billiard ball approaches a side cushion at a 45° angle with speed 1.80m/s It rebounds at a 45° angle, as shown in Figure P3.61, with the same speed.

(a) Find the change in the ball s velocity.

(b) More realistically, the ball might lose a little speed, rebounding at 1.60 m/s Now what's its velocity change?

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