1.

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.

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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