To solve this problem we will use the concepts related to power, defined as the amount of energy applied over a period of time.
The energy in this case is the accumulated in the form of potential energy, over a period of time. Thus we will have that the mathematical expression of the power can be expressed as
[tex]P = \frac{E}{t}[/tex]
Here,
E = Energy
t = time
As the energy is equal to the potential Energy we have tat
[tex]P = \frac{mgh}{t}[/tex]
The weight (mg) of the man is 700N, the height (h) is 8m and the time is 10s, then:
[tex]P = \frac{700*8}{10}[/tex]
[tex]P = 560W[/tex]
Therefore the correct answer is A.
