1. The problem statement, all variables and given/known data Hey i've attached the question. My main problem is figuring out how to start. 2. Relevant equations not exactly sure, PE=mgh? efficiency= used power/total power *100 = used power/ 2950 * 100... 3. The attempt at a solution i calculated the potential energy 70*30*9.81*7.5=154507.5 J I thought about finding the angle of elevation but don't have enough information.