You push a box up a ramp (friction between the box and the ramp is not negligible). Call the initial state when you begin to push the box. Call the final state after you have pushed the box up the ramp a distance of 0.5 m and it is moving with a speed of 2 m/s. 1. System: box + ramp 2. System: you 3. System: box + ramp + Earth 4. System: box 5. System: box + ramp + Earth + you This question is asking whether or not the energy of the system stays constant or if the energy changes in each one of these situations. It is dealing with the Work Energy Theorem

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