shivaherirugi shivaherirugi

15-09-2019
Physics

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A man weighting 600N runs up the hill. It takes him 20s to reach top which is 15m from ground. Calculat
A) a work he has done
B) the power output his legs

Respuesta :

MathPhys MathPhys

15-09-2019

Answer:

A) 9000 Joules

B) 450 Watts

Explanation:

Work equals change in energy:

W = ΔPE

W = mgΔh

W = (600 N) (15 m)

W = 9000 J

Power is work per time:

P = W/t

P = (9000 J) / (20 s)

P = 450 W

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