The 1580-kg car has a velocity of 25 km/h up the 11-percent grade when the driver applies more power for 12 s to bring the car up to a speed of 62 km/h. Calculate the time average Fof the total force tangent to the road exerted on the tires during the 12 s. Treat the car as a particle and neglect air resistance. 11 100 Answer: F = i kN

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.