Which of the following requires more work: to change the speed of a car from 0 to 40 mph (0 to 64 km/h) or from 40 to 65 mph (64 to 105 km/h)?
What will be an ideal response?
Work (which is equal to the change in kinetic energy) required when the speed of a car
goes from 0 to 40 mph (0 to 64 km/h) is calculated as follows:
Similarly, work required when the speed of a car goes from 40 to 65 mph (64 to 105
km/h) is calculated as follows:
Therefore, changing the speed of a car from 40 to 65 mph (64 to 105 km/h) requires more
work.
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