Answer: The power produced by the girl is 400 watts.
Explanation-
According to the question, load (w) = 100N
Height, h = 2.0m
Time taken, t = 0.5 sec
Mathematically, Power = Work done/ Time taken
Work( W) = Force × Distance
= Load × Height
= 100 × 2.0 = 200 Joules
Putting the value of work and time in the formula of power, we get-
Power = 200Joule /0.5 sec
= 400 watts