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A girl on a skateboard (total mass of mm = 43 kg) is moving at a...

A girl on a skateboard (total mass of mm = 43 kg) is moving at a speed of vv = 5.6 m/s at the bottom of a long ramp. The ramp is inclined at 15° with respect to the horizontal. She travels 4.2 m upward along the ramp before stopping.

Calculate the energy loss ΔEloss due to the friction f.

Calculate the magnitude of the frictional force f between the skateboard and the incline surface

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