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Tastosis

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## Homework Statement

A man is pushing a box on top of a plane that is inclined 20 degrees above the horizontal, with a distance of 10 m. The weight of the box is 20 kg and the coefficient of kinetic friction is 0.30. The velocity is constant.

How much force is exerted by the man? Find the work done by force and the work done by gravity.

## Homework Equations

Summation of forces along x-axis = F - f = 0

Summation of forces along y-axis = n - Wy = 0

f = uk * n

W of Force = Fdcos

W of weight = mgdcos

## The Attempt at a Solution

[PLAIN]http://img96.imageshack.us/img96/4928/17512380.jpg [Broken]

Is my free body diagram correct?

If someone can give a clue on how to get Wy, I think I can solve this. Thanks!

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