Question

Engine of a car of mass 1500 kg, keeps car moving with constant velocity 5m/s. If frictional force is 1000 N, power of engin is ________
(A) 5 kW
(B) 7.5 kW
(C) 15 kW
(D) 75 kW

Answer 1

Answer:

Power = 5kW

Explanation:

mass of car = 1500 kg

velocity = 5 m/s

frictional force = -1000 ( since it applies in opposite direction of motion)

The force required to be produced by the engine has to be equal such that the net force acting on the car is 0 N

thus force of engine = 1000 N

Work = Force × displacement

Work = 1000 N × 5 m ( in 1 sec)

Work = 5 kJ

Power = Work / time

Power = 5kJ/ 1s

Power = 5kW

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