A men weighing 70kg carries a weight of 10kg on the top of tower 100m high. Calculate the work done by the man (g=10m/s2).

workdone is 80,000 joules.

total mass= 10+70 =80kg

workdone= potential energy

WD= mgh= 80*10*100=80,000joules

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mass of man= 70kg

mass of another object=10kg

Total mass= 70+10+80kg

work = FS

  =  mgh  ( F=mg)

  =  80*10*100

  =  80000 joules

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