a roller coaster ride at amusement park lifts a car of mass 700 kg to a point A at a height of 90 m above the lowest point on the track as shown above. the car starts from rest at Point A, rolls with negligible friction down the incline and follows the track around a loop of radius 20 m. Point B, the highest point of the loop, is at a height of 50 m above the lowest point of the track. Calculate the magnitude of the downward force of the rails on your car when it is upside down at the top of the loop.

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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.