Question

A man weighing $60 \,kg$ climbs up a staircase carrying a load of $20 \,kg$ on his head. The staircase has $20$ steps each of height $0.2\, m$ . If he takes $10\, s$ to climb, find his power.

• A. $313.6 \,W$
• B. $120.6 \,W$
• C. $510 \,W$
• D. $0$

Answer 1

Answer: (A)

$313.6 \,W$

Answer 2

Here, $m = 60 + 20 = 80 \,kg$ $h = 20 \times 0.2 = 4\, m$ , $g = 9.8 \,ms^{-2}$ , $t = 10\, s$ $P = \frac{W}{t}= \frac{mgh}{t}$ $= \frac{80 \times 9.8 \times 4}{10} = \frac{3136}{10}$ $= 313.6\,W$