As the driver steps on the gas pedal, a car of mass 1 160 kg accelerates from rest.During the first few seconds of motion, the car’s acceleration increases with timeaccording to the expressiona = 1.16t − 0.210t2 + 0.240t3where t is in seconds and a is in m/s2. (a) What is the change in kinetic energy of thecar during the interval from t = 0 to t = 2.50 s? (b) What is the minimum average poweroutput of the engine over this time interval? (c) Why is the value in part (b) describedas the minimum value?

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.