Net Work & Work-Energy Theorem Video Lessons

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Problem: Which requires more work, increasing a carʹs speed from 0 mph to 30 mph or from 50 mph to 60 mph?A. 50-60 mphB. 0-30 mphC. Same in both cases

FREE Expert Solution

The work done is equivalent to energy.

Therefore, the work can be compared to the kinetic energy.

W = ΔK

But, K = (1/2)mv2

ΔK = (1/2)m(vf2 - vi2)

1 mph = 0.447 m/s

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Problem Details

Which requires more work, increasing a carʹs speed from 0 mph to 30 mph or from 50 mph to 60 mph?

A. 50-60 mph

B. 0-30 mph

C. Same in both cases

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