cricket ball of mass 200 g is thrown horizontally at a ffxed vertical metal barrier. The cricket ball hits the barrier when it is travelling at 30 m s−1 and then rebounds. a Find the kinetic energy lost at the impact if e = 0.4. b Give one possible form of energy into which the lost kinetic energy has been transformed.

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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.