What is the work done to increase the velocity of a car from 36km/h to 72km/h if the mass of the car is 1500 kg? Does the work done by the force have a negative or a positive magnitude?
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Explanation:
Given m = 1500 kg,
u = 36 km h^-1 = 10 m s^-1,
v = 72 km h^-1 = 20 m s^-1,
W = ?
Work done = Change in kinetic energy =1/2 m (v^2-u^2)=1/2 x 1500 x (20^2 -10^2) = 225000 J
The work done is positive.
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