Answer:
Case-I (Young man) Given, \[W=500Jt=5s\] We know, \[P=\frac{W}{t}=\frac{500}{5}=100W\] Case-II (Old man) Given, \[W=500Jt=10\,s\] We know, \[P=\frac{W}{t}=\frac{500}{5}=50W\] Therefore, young man has more power.
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