A slingshot consists of a light leather cup containing a stone that is pulled back against the elastic force of two rubber bands. It takes a force of 30 N to stretch the bands 1 cm. a) What is the PE of a 50.0 g stone that is pulled back 20 cm from the equilibrium position? b) with what speed does the stone leave the slingshot?

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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.