The force resisting the motion of a car is taken as being proportional to the square of the car’s speed. The magnitude of the force at a speed of $20m{s^{ - 1}}$ is 800 N.
What effective power is required from the car’s engine to maintain a steady speed of $40m{s^{ - 1}}$?
1 )
32 kW
2 )
64 kW
128 kW
4 )
512 kW
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