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The driver of a 840.0 kg car decides to double the speed from 22.4 m/s to...

The driver of a 840.0 kg car decides to double the speed from 22.4 m/s to 44.8 m/s. What effect would this have on the amount of work required to stop the car, that is, on the kinetic energy of the car?

KEi= ×105 J

KEf= ×105 J

(select)3,4,8 or 2 times as much work must be done to stop the car.

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Answer #1

Answer is 4 times as much work needs to be done as compared to be done to stop the car at its initial velocity.

Calculation is as shown below.

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