Calculating distance given total work?

[heythere1010]

Homework Statement

The total work done is 2.42 * 10^4 J (work is from friction and person pulling a sled). The force of the person pulling is 135 N and the force of friction is 67 N. The angle on the sled is 48.

Homework Equations

W=f*d*cos0

The Attempt at a Solution

I was thinking I would need to do the Wt=f*dcos0 + f*dcos0

24200=135*d*cos 48 + 67*d*cos 180

I did this, but the answer was incorrect. the answer is 963 m.[/B]

 

[SammyS]

Homework Statement

The total work done is 2.42 * 10^4 J (work is from friction and person pulling a sled). The force of the person pulling is 135 N and the force of friction is 67 N. The angle on the sled is 48.

Homework Equations

W=f*d*cos0

The Attempt at a Solution

I was thinking I would need to do the Wt=f*dcos0 + f*dcos0

24200=135*d*cos 48 + 67*d*cos 180

I did this, but the answer was incorrect. the answer is 963 m.[/B]

Start by drawing a free body diagram.

 

[heythere1010]

Start by drawing a free body diagram.

Yes, the question has given that.

 

[SammyS]

Yes, the question has given that.

In what direction is the frictional force, relative to the direction of travel?

 

[heythere1010]

In what direction is the frictional force, relative to the direction of travel?

The force of friction is west and the traveling direction is east.

 

[SammyS]

The force of friction is west and the traveling direction is east.

Then, does friction do positive work, or does it do negative work ?