Question

plzz help me in this

Answer 1

Mass of man, m = 60kg
Height of one step = 20cm
Height of 30 steps = 20 x 30 = 600cm = 6m
Time = 40 sec.
.
Work done =
$= m \times g \times h \\ = 60 \times 10 \times 6 \\ = 3600j$
.
Power =
$\frac{work \: done}{time \: taken} \\ = 3600 \div 40 \\ = 90w$
.
746 watt = 1 horse power
1 watt =$\frac{1}{746}$......
.
.
then 90 watt =
$\frac{1}{746} \times 90 \\ = 0.12 \: h.p$