A girl on a skateboard (total mass of 40 kg) is moving at a speed of 10 m/s at the bottom of a long road. The road is inclined at 20o with respect to the horizontal. If she travels 14.2 m upward along the road before stopping, without pushing in any way, what is the net frictional force on her?

Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge,    then the following gives us the potential difference,      the formula  may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get    using q = 8.00  × 10⁻¹⁹ c and  δv = 2.00 v, we get    the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.

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