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A boy pushes a 125 kg crate up a ramp inclined at 25o from the horizontal the floor by applying a force of 770 N

A boy pushes a 125 kg crate up a ramp inclined at 25o from the horizontal the floor by applying a force of 770 N parallel to the ramp. Calculate the coefficient of kinetic friction if the crate slides up the ramp at a constant velocity.

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