A ball is thrown onto a rough floor at an angle θ. If it rebounds at an angle φ and the coefficient of kinetic friction is μ, determine the coefficient of restitution e. Neglect the size of the ball. Hint: Show that during impact, the average impulses in the x and y directions are related by { I }_{ x } = μ { I }_{ y } . Since the time of impact is the same, { F }_{ x } Δt = μ { F }_{ y } Δt or { F }_{ x } = μ { F }_{ y } .