The force resisting the motion of a car is proportional to the square of the car’s speed. The magnitude of the force at a speed of 20.0 m s$^{-1}$ is 800 N.
What useful output power is required from the car’s engine to maintain a steady speed of 40.0 m s$^{-1}$?
1 )
32 kW
2 )
64 kW
128 kW
4 )
512 kW
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