A 1.5-lb ball A is moving with a velocity of magnitude 18 ft/s when it is hit by a 2.5-lb ball B which has a velocity of magnitude 12 ft/s. Knowing that the coefficient of restitution is 0.8 and assuming no friction, determine the velocity of each ball afterimpact.

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= 18 ft/s 40° A 50° B 12 ft/s