A boy of mass 40kg runs up a flight of 15 steps each 15cm high in 10s.Find the power developed by him: Take g=10Nkg−1
A
9W
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B
0.9W
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C
90000W
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D
90W
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Solution
The correct option is D90W Force=m×g=40×10=400N Workdone=F×s Here we have 15 steps with 15 cm hence total displacement is 225cm that is 2.25m W=400×2.25=900J Power=work/time P=900/10=90Watt Hence we need a power of 90W.