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Question

Arun is travelling with his friends in a car. The car suddenly stops due to some problem in the engine. Arun and his friends apply a force of 1000 N to drag the car to the nearest garage with a displacement of 1.2 km from that place. Determine the total power applied by them, if they dragged it to the nearest garage in 20 minutes.


A

2000 W

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B

3000 W

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C

1000 W

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D

500 W

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Solution

The correct option is C

1000 W


Given,
Force, F = 1000 N
Displacement, s = 1.2 km
We know that,
Work done = Force x displacement
Work done =1000×1.2×1000 Nm
= 12×105J.
Now, the total power required can be calculated as,
Power = Work doneTotal time taken
Power = 12×10520×60 = 1000W.


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