A boy whose mass is \( 30 \mathrm{~kg} \) climbs, with a constant speed, a vertical rope of \( 6...

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A boy whose mass is \( 30 \mathrm{~kg} \) climbs, with a constant speed, a vertical rope of \( 6 \mathrm{~m} \) long in \( 10 \mathrm{~s} \). The power of the boy during the climb is : (Take \( g=10 \mathrm{~ms}^{-2} \) )
(A) \( 60 \mathrm{~W} \)
(B) \( 3000 \mathrm{~W} \)
(C) \( 180 \mathrm{~W} \)
(D) \( 5 \mathrm{~W} \)
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