A boy of mass 40 kg gets an energy of 21 kJ by eating a bread. If the efficiency is 
, then the height that can be climbed by him using this energy, is
Text Solution
Verified by ExpertsThe correct answer is:
B
To climb a height h, the boy utilizes potential energy = mgh
In order to climb, he will use the efficient energy.
Energy of one bread 
Efficiency of boy 
Hence, energy consumed by boy
…(i)
From law of conservation of energy, this energy is utilized in giving potential energy mgh, where g is acceleration due to gravity.
…(ii)
Equation Eqs. (i) and (ii), we have
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