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5. A girl on a skateboard (total mass of 45.0 kg) is moving at a speed of 4.90 m/s at the bottom ofa long ramp. The ramp is inclined at 15 with respect to the horizontal. If she travels 4.50 m upward along the ramp before stopping, find the energy loss AEloss due to the friction f and the amount of work done by friction. Finally, calculate the magnitude of frictional force f between the skateboard and the incline surface. 0 Initial mechanical energy: E = 4' J 0 Final mechanical energy: Ef= AEloss = Ef _ Ei = Work done by friction =