If a machine is 50 percant efficent how much energy must you apply to lift a 100 newton weight a distance of 10 meters?

To find out how much energy must be applied, first calculate the work required to lift the weight by using the formula: work = force x distance. Work = 100 Newtons x 10 meters = 1000 Joules. Since the machine is 50% efficient, you would need to double the work done, so you would need to apply 2000 Joules of energy to lift the weight.