A 100 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 200 N. For the first 15 m the floor is frictionless and for the next 15 m the coefficient of friction is 0.15. * What is the final speed of the crate?

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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.