1. The problem statement, all variables and given/known data 2. Relevant equations Conservation of Energy: ∑T1+∑U1-2=T∑2 3. The attempt at a solution ∫(600+2s2)ds - 100*9.8*15 = (1/2)mv2. However, the term of work done by the force is less than the term of work done by gravity! The book has a solution, which is exactly this except the term of work done by the motor is multiplied by 2. Could it have something to do with the pulley? Otherwise, I don't get it. Thanks.