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A girl on a skateboard (total mass of 40 kg) is moving at a speed of...

A girl on a skateboard (total mass of 40 kg) is moving at a speed of 15 m/s at the bottom of a long ramp. The ramp is inclined at 18° with respect to the horizontal. If she travels 13.4 m upward along the ramp before stopping, what is the net frictional force (in N) on her? (Assume the positive direction is upward along the ramp. Indicate the direction with the sign of your answer.)

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