the velocity of a car increases from 54 km/hr to 72 km/hr if the mass of the car is 1500 kg find work done to increase the velocity
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According to work energy theorem the work done is equivalent to the difference of the kinetic energy of the car.
w = 1/2×1500(20^2 — 15^2)
= 750(400 — 225)
= 750×175 = 131250 joule.
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