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## Homework Statement

A 260 kg piano slides 4.3 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40.

Figure 6-36

(a) Calculate the force exerted by the man.

391.3469084 N

(b) Calculate the work done by the man on the piano.

-1682.791706 J

(c) Calculate the work done by the friction force.

-3795.408294 J

(d) What is the work done by the force of gravity?

? J

(e) What is the net work done on the piano?

? J

## Homework Equations

Work=Force*Distance

gravity=9.8

Fnet=Sum of all forces

## The Attempt at a Solution

Letters a through c are correct, but I have not been able to solve for d and e. I have tried doing W=FX for letter d, but with no luck. I cannot solve for e without solving for d.

Any help is appreciated. Thank you!