Does Diving into Water Involve Negative Work?

[harp AP 2010]

Homework Statement

If you dive into the water does it do work on you? Positive or negative?

Homework Equations

The Attempt at a Solution

I think I know this one, it is negative work because he is pushed up from resistance, but continues to go down.

 

[brewAP2010]

I would say that the water does negative work on you because its working like friction. Even though you are still moving forward the water is pushing on you opposite the direction that you are moving.

 

[jmb88korean]

Its like punching a piece of paper. The paper works on you but you still break through. Relative to the paper, since the fist broke through, work is negative.