The correct answer to this question is B, 560W. Power is defined as work over time. This work is measured in watts, which is abbreviated W. This work overtime is force applied to a distance. Work is measured in Joules, which is abbreviated with the letter J.

To find Power, the following equation should be used p = F x d divided by T. We know that d is 4m and t is 4.2s. To solve F, we would use this equation- 60kg x 9.81m/s2, which equals 588.6N. Plugging those answers into the equation 599.6N x 4 / 4.2s, which gives us 50 nxm/s = 560 j/s = 560W.