Work input/output, efficient probelm, just need someone to check my work :) 1. The problem statement, all variables and given/known data Because there is very little friction, the lever is an extremely efficient simple machine. Using a 90% efficient lever, what input work is required to lift an 18kg mass through a distance of 0.5m? 2. Relevant equations (Fout/Fin)/(Din/Dout) 3. The attempt at a solution (Fout/Fin)/(Din/Dout) (176.6N/Fin)/(Din/.5m)=.9 so you get (Fin)(Din)=98.1 which FD is work so 98.1J is the answer correct?