1. How much work (energy) is needed to lift an object that weighs 200 N to a height of 4 m? 2. How much power is needed to lift the 200-N object to a height of 4 m in 4 s? 3. What is the power output of an engine that does 60 000J of work in 10 s? 4. The block of ice weighs 500 newtons. a. What is the mechanical advantage of the incline? b. How much force is needed to push it up the incline (neglect friction)