Question

A 70 kg man runs up stairs of total height of 3 meters in 2 seconds. How much
power is exerted by the man? (g=9.8m/s)​

Answer 1

Answer:

Explanation:

m = 70 kg

s = 3m

t = 2s

a = 9.8 m/s²

To find : P=?

W = Fs

   = ma x s

   = 70 x 3 x 9.8

   = 210 x 9.8

   = 2058 J

P = W/t

   = 2058/2

P = 1029 Watts

∴ A power of 1029 watts is exerted by the man.

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Answer 2

Answer:

Explanation:

First calculate energy

Mass=70kg

Height=3metre

Time=2sec

Energy=mgg

=70*3*2

=420J

Power=energy/time

=420/2

=210watt