A suitcase is hanging straight down from your hand as you ride an escalator. Your hand exerts a force on the suitcase, and this force does work. This work is a. positive when you ride up and negative when you ride down b. negative when you ride up and positive when you ride down c. positive when you ride up or down d. negative when you ride up or down

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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.