A) 22.5 m
B) 15 m
C) 10m
D) 5m
Correct Answer: B
Solution :
Here : Energy of one apple = 2112 J \[=21\times {{10}^{3}}J\] Efficiency of the boy = 28% = 0.28 Mass of the boy m = 40 kg Here the actual energy consumed by the boy is given by as \[=0.28\,\times 21000=5880\]] ...(1) and the energy consumed by the boy in climbing h meter height is given by \[=mgh=40\times 9.8\times h\,J\] ...(2) Equating equations (1) and (2) we get \[40\times 9.8\times h\,=\,5880\,J\] \[h=\frac{5880}{40\times 9.8}=15\,m\]You need to login to perform this action.
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