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A sled of 150kg mass moves along a smooth horizontal surface at 7m/s. The sled encounters a rough spot that exerts a force of -90 Nt on the sled. a) What is the acceleration of the sled? b) Calculate how much work is done by the fricitional force on the sled if the patch is 15m in length. c) What is the sled's final velocity as it leaves the rough spot?
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