15-85. A ball is thrown onto a rough floor at an angle of e = 45°. If it rebounds at the same angle o = 45°, determine the coefficient of kinetic friction between the floor and the ball. The coefficient of restitution is e = 0.6. Hint: Show that during impact, the average impulses in the x and y directions are related by I, = ul,. Since the time of impact %3D

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