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  3. A man of mass 60 kg climbs up a 20 m long staircase to the top of a building 10 m high. The work done by him (Take g = 10 ms2) is x ´ 102J. Find x

. A man of mass 60 kg climbs up a 20 m long staircase to the top of a building 10 m high. The work done by him (Take g = 10 ms2) is x ´ 102J. Find x

A man of mass 60 kg climbs up a 20 m long staircase to the top of a building 10 m high. The work done by him (Take g = 10 ms2) is x ´ 102J. Find x ?

 

Best Answer

Ans-. According to work- energy theorem, we have

 Wmax = change in M.E

 Wmax = (Uf + kf) = (mgh + O) – ( 0 + 0)

 = mgh = 60 ´ 10 ´ 10 = 6000 J = 6 kJ

 

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