Den pushes a desk 400 cm across the floor. He exerts a force of 10 N for 8 s to move the desk.What is his power output? (Power: P = W/t)

Convert the distance to meters: 400 cm = 4 m. The work done is force times distance, so W = 10 N × 4 m = 40 J. Power is work divided by time: P = 40 J ÷ 8 s = 5 W, so the correct choice is 5 W.

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