Answer:
Mass of box, m = 15 kg; Mass of the person, M = ? height, \[h=5\,m;\,\,g=9.8\,\,m/{{s}^{2}}\] Work done, W = 4900 J We know, \[W=(M+m)g\,\,h\] \[\Rightarrow 900=(M+15)\times 9.8\times 5\] \[\Rightarrow M+15=100\Rightarrow 85\,\,kg.\]
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