Question

a man whose mass is 80 kg climbs up 30 steps of stairs in 30 seconds if each step is 12.5 CM in height calculate the power used in climbing the stairs given that the gravity is 10 M per second

Answer 1

Given,
mass of man = 80 kg
height is climbed by man = 30 × 12.5 = 375 cm = 3.75 m
time taken = 30 sec

Now,power = weight of man × height is climed by man/time taken
= Mass × acceleration due to gravity × 3.75/30
= 80 × 10 × 375/30
= 100 W

Hence, answer is 100W

Answer 2

Solution:-

given by:-
》mass of man (m) = 80kg
》clinmbing height (displacement-s)
= 30×12.5 = 375cm = 3.75m
》gravity (g) = 10m/s^2
》time(t) = 30second

●work = force×displacement [ f = mg]
= mass×gravity×displacment
= 80×10×3.75
=3000 j
●power(p) =
$\frac{w}{t} = \frac{3000}{30} = 100 \: w$
》hence, power = 100 watt

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