[tex]\tt{\huge{\blue{Explanation:}}}[/tex]
The power of an object doing a work W in a given time t is given by
[tex]\boxed{P = \frac{W}{t}}[/tex]
where:
P = power
W = work
t = time
[tex]\tt{\huge{\red{Solution:}}}[/tex]
Solving for F
F = weight = mg
F = (65 kg)(9.8 m/s²)
F = 637 N
Solving for W
W = Fd
W = (637 N)(7.5 m)
W = 4,777.5 J
Solving for P
[tex]P = \dfrac{W}{t}[/tex]
[tex]P = \dfrac{\text{4,777.5 J}}{\text{10 s}}[/tex]
[tex]\boxed{P = \text{477.75 W}}[/tex]
Therefore, the power expended by the girl is 477.75 W.
[tex]\\[/tex]
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