Please may you help me in this homework.  A roller coaster is at rest on the top of a 30m hill (point A). The car starts to roll down the hill and reaches point B, which is 10m above the ground, then rolls up the track to point C which is 25m above the ground.  A) a student assumes no energy is lost, and solve for how fast the car is moving at point C using energy arguments. What answer did he get? B) if the final speed at C is actually measured with asonar gun and is found to be 2.0m/s, what percentage of the energy was not conserved? ( not conserved) what happened to the energy?

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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.