1. The problem statement, all variables and given/known data A washing machine that weighs 1400N must be put into a delivery truck bed that is 1.2 m off the ground. A worker uses a force of 450N to push the machine up a ramp that is 4.3m long. What is the efficiency of the inclined plane? 2. Relevant equations e=(MA/IMA)100---- efficiency of a machien in % is = to its mechanical advantage, divided by the ideal mechanical advantage, multiplied by 100. MA=Fr/Fe---- mechanical advantage=the resistance of force divided by the effort force. IMA=De/Dr----the ideal mechanical advantage of an ideal machien is=to the displacement of the effort force, divided by the displacement of the load. 3. The attempt at a solution MA=1400N/450N=3.11N, I think i did that part right. IMA=1.2m/4.3m=0.28m, I think i did this part wrong. e=(3.11N/0.28m)100=1110.71joules.