A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 7.2 m/s. If the coefficient of friction between the sled's runners and snow is 0.040 and the boy and sled together weigh 490 N, how far does the sled travel on the level surface before coming to rest?

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A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 7.2 m/s. If the coefficient of friction between the sled's runners and snow is 0.040 and the boy and sled together weigh 490 N, how far does the sled travel on the level surface before coming to rest? 

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