1. The problem statement, all variables and given/known data A 50-meter rope weighing 2 N/m supports a piano weighing 600 N. Find the work done in lifting the piano 25 meters 2. Relevant equation. None of the calculus equation, techniques covers this type of question with mass/length involved. 3. The attempt at a solution I know the formula $W=GMm(1/r-1/r_i)$ for work done by gravity pulling an object downward. The reverse can be used for raising an object. But since $G$ is not given, I assume this formula is irrelevant.