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A FORCE IS APPLIED, ON ACAR OF MASS 8ooky, SO THATIT'S SPEED INCREASES FROM36 km (PER hawz), To 84 KM (PER HOUR),FIND THE WORK DONE BY THEFORCE DONE BY THE CAR. |
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Answer» Mass of car m = 800 kgInitial velocity = 36 km/h =36 x 5/18 = 10 m/sFinal velocity = 72 km/h = 84 x 5/18 = 70/3m/sInitial kinetic energy = = ½ × mv2 = ½ x1500 x (10)2 = 75000 JIncreased kinetic energy = 1/2 mv2 = ½ x800 x(70/3)2 =217,777.77 J Work done = Change in kinetic energy= 217777.77--75000 JHence the work done by the force on the car = 142777.77J |
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