An object of mass m which is hang (by means of a string of negligible mass) at the surface of a reservoir of water placed on the ground. Assuming that the reservoir is of depth D and the object released to fall vertically downward. Derive the equations of motion of the object assuming that the resistance offered by the water is R Newtons. How much time is need to get the object to the bottom of the reservoir? With appropriate choice of parameters, plot the potential energy of the object as a function of time.

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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.