The 1-lb ball A is thrown so that when it strikes the 10-lb block B it is traveling horizontally at 20 ft/ s. If the coefficient of restitution between A and B is e = 0.6, and the coefficent of kinetic friction between the plane and the block is μ _k = 0.4, determine the distance block B slides on the plane before stopping.

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20 ft/s A В