A force applied on a car of mass 1500 kg so that its speed increases from 54 km/hr to 72 km/hr. find the work by the force in the car.
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v = 72-54 km/h = 18km/h = 18000/60*60 m/s
= 5 m/s
work done = kinetic energy = 1/2mv^2
m = 1500kg
Work done = 1/2 x 1500 x (5)^2 J
= 750 x 25 = 18750 Joules(J)
= 5 m/s
work done = kinetic energy = 1/2mv^2
m = 1500kg
Work done = 1/2 x 1500 x (5)^2 J
= 750 x 25 = 18750 Joules(J)
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