A 70 kg jogger walks up a 4.5 m staircase in 4 s Estimate the jogger's power output in watts?

To estimate the jogger's power output, we first calculate the work done against gravity, which is the product of weight and height. The weight of the jogger is (70 , \text{kg} \times 9.81 , \text{m/s}^2 = 686.7 , \text{N}). The work done is (686.7 , \text{N} \times 4.5 , \text{m} = 3089.65 , \text{J}). Power output is work done divided by time, so (P = \frac{3089.65 , \text{J}}{4 , \text{s}} \approx 772.41 , \text{W}). Thus, the jogger's power output is approximately 772 watts.