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I used the formula for PEC. 1/2k(deltaX)^2 which got me to 320 joules. That is wrong though. What am i doing wrong???

If a force of .85N pulled parallel up along the surface of the incline is required to raise the mass back to the top of the incline, how much work is done?

i used W=fd

w=.85(40)

w=34

but that answer is wrong. Im doing something wrong.