A set of stadium stairs consist of 90, 20 cm high steps. A 70 kg runner is training by traversing up and down the steps. a. What is the change of potential energy that occurs with each step? For all 90 steps? b. How much work is required to travel up the steps in 20 sec? In 15 sec? c. What is the power required to run up the steps in 20 sec? In 15 sec? d. What is the total work done over the course of the stadium training session? Why?

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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.