Answer:
Given, \[m=70\,\,kg\] Height of each stair \[(h)=0.20\,\,m\] \[\therefore \] Height of 50 stairs \[=50\times 0.20=10\,\,m\] \[g=10\,\,m/{{s}^{2}}t=20s\] \[F=?W=?\] (i) We also know, \[W=mgh\] \[\Rightarrow F=70\times 10=700\,\,N\] (ii) We also know, \[W=mgh\] \[\Rightarrow W=70\times 10\times 10=7000\,\,J\]
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