question_answer

What should be the mass of a man if he has to do 2500 joules of work in climbing a tree 5 m tall? (\[\text{g}=\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\])

Answer:

Given,   \[W=2500\,Jh=5m\]                 \[g=9.8m/{{s}^{2}}m=?\] We know, \[W=mgh\Rightarrow m=\frac{W}{gh}\] \[\Rightarrow m=\frac{2500}{9.8\times 5}=51.02\,\,kg\]