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{"ops":[{"insert":"1.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0A child starts sledding from rest, going down a 40 m long 7.5\u00b0 incline, then coasting across a horizontal stretch. The mass of the sled + child is 35 kg, and the coefficient of kinetic friction is 0.060. \na.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Make force diagrams for the sled + child on both the hill and the horizontal stretch.\nb.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Resolve the weight of the sled + child along and perpendicular to the plane.\nc.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Determine the reaction force on the sled + child.\nd.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Determine the speed of the sled + child at the bottom of the incline.\ne.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0How far along the horizontal stretch does the sled + child travel before stopping?\nh.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Determine how much work is done on the sled + child by the gravitational force while the child + sled is moving along the incline.\ni.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0By considering the energy of the system and energy transformations, determine the speed of the sled + child at the bottom of the incline. Does your answer agree with part d?\n"}]}

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