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A 2.1 ✕ 103-kg car starts from rest at the top of a 4.7-m-long driveway that...

A 2.1 ✕ 103-kg car starts from rest at the top of a 4.7-m-long driveway that is inclined at 21° with the horizontal. If an average friction force of 4.0 ✕ 103 N impedes the motion, find the speed of the car at the bottom of the driveway.

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