Ronald pushes a box up an inclined plane with 35% efficiency. If 224 joules of energy went

Question

into moving the box, how much energy did Ronald put into the inclined plane?
78.4 joules
189 joules
640 joules
145.6 joules

Answer 1

To calculate the total energy Ronald put into the inclined plane, divide the energy that went into moving the box by the efficiency.

Total energy = Energy input / Efficiency
Total energy = 224 joules / 0.35
Total energy = 640 joules

Therefore, Ronald put 640 joules of energy into the inclined plane.

The correct answer is 640 joules.