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## Homework Statement

An airplane pilot fell 370 m after jumping without his parachute opening. He landed in a snowbank, creating a crater 1.1 m deep, but survived with only minor injuries. Assuming the pilot's mass was 80 kg and his terminal velocity was 50 m/s, estimate: (a) the work done by the snow in bringing him to rest; (b) the average force exerted on him by the snow to stop him; and (c) the work done on him by air resistance as he fell.

I need help on part c.

## Homework Equations

[tex] W = \frac{1}{2}mv_2^2 - \frac{1}{2}mv_1^2[/tex]

## The Attempt at a Solution

taking v

_{2}= 50 m/s and v

_{1}= 0, the work would be 100000 J. But shouldn't the work done be negative, because the force of air resistance is upward and the displacement is downward?