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A 58.4-kg person, running horizontally with a velocity of +3.84 m/s, jumps onto a 10.7-kg sled that is initially at rest.
(a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away. (Indicate the direction with the sign of your answer.)(b) The sled and person coast 31.5 m on level snow before coming to rest. What is the coefficient of kinetic friction between the sled and the snow?

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