Use g = 9.80 m/s^2 and assume all numbers are accurate to 3 significant figures unless otherwise indicated.   a. A 15 kg box, initially at rest, slides down a ramp 2 m long that is inclined at an angle of 20 degrees with the horizontal. If there is no friction between the ramp surface and the crate, what is the kinetic energy (in J) of the crate at the bottom of the incline?   b. After sliding down the ramp, the 15 kg box from part a slides on a horizontal surface whose coefficient of kinetic friction = 0.25. How far along the surface will the box slide before coming to rest?

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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.