3. A 60.0-kg skier is at top of a slope. At the initial point, she is 10 m vertically above point A. a. Setting the zero level for gravitational potential energy at B, find the gravitational potential energy of this system when the skier is at A and then at B. Finally, find the change in potential energy of the skier-Earth system as the skier from point A to point B. 100 10.0 m B

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.