The figure below shows a roller-coaster car on a track. The car is fully loaded with passengers and has a total mass of 485 kg. At point A, the car is at the lowest point in a circular arc of radius r1 = 12.0 m. At point B, the car is at the highest point of a circular arc of radius r2 = 16.8 m. (a) If the car has a speed of 25.0 m/s at point A, what is the magnitude of the force (in N) of the track on the car at this point? (b) What is the maximum speed (in m/s) the car can have at point B in order for the car to maintain contact with the track at all times (that is, so that it does not "jump" off the track)?

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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.