Pushing a box up an inclined plane

[tuffshorty]

I need to calculate the efficiency of a inclined plane if a 60 pound box is being pushed up it... The inclined plane is 16 feet long (The plane itself, not the base) and it is raised up 4 feet high.

Homework Equations

efficiency= useful work output/total work input
w=fd
w= work
f= force
d= distance

The Attempt at a Solution

I have The total amount of work you are putting out is 480 ft.lb ... but I am not sure how to get the total work input...

 

[MalachiK]

Is the box being pushed up at a constant speed, or is it accelerating?

 

[ImAnEngineer]

Is there friction that needs to be accounted for?