Question
Download Solution PDFA man of mass 80 kg climbs up 4 m high stairs in 10 sec. Find the power spent by the man. (Take g = 10 m/sec2)
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
Work done = mgh
where, m = mass of body; g = acceleration due to gravity; h = height of fall
Power = \(\frac{W}{t}\)
Calculation
Given
mass (m) = 80 kg
g = 10 m/sec2
h = 4 metre
t = 10 seconds
Work done \(=mgh=80\times10\times4=3200J\)
Power used, \(P= \frac {W}{t}=\frac {3200}{10}=320 W\)
The power spent by the man is 320 watts.
Last updated on May 9, 2025
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