question_answer

A person of mass 50 kg carries a case of 10 kg to the upstairs at a vertical height of 4 m. The work done is ?????

Answer:

Mass of person, M = 50 kg ; Mass of case, m = 10 kg; \[h=4\,\,m;\,\,g=9.8\,\,m/{{s}^{2}}\] Work done, W = ? \[W=Total\,\,mass\times g\times h\] \[=(M+m)gh\] \[=(50+10)\times 9.8\times 4\] \[=2352\,\,J\]