How much work would it take to push a # 12 kg # weight up a # 9 m # plane that is at an incline of # pi / 3 #?
It depends on how much force is exerted. But nevertheless, we can measure the minimum amount of work needed to do so. In this case we would assume the body very slowly and the force exerted is almost same as that is opposing its movement. In that case,
Now, change in potential energy =