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A 40 Kg boy runs the staircase to a floor 5 meter higher in 7 seconds What is his power output?
Wiki User
∙ 11y ago
Power (W) is work (J) done over time (s). Work (J, Joule) is force (N, Newton) moved through a distance (m).
Weight (N) is the force (N) due to gravity which is not the same as someone's mass (kg).
mass = 50 kg
distance = 5 m
time = 7 s
Force due to gravity = m x g
= 50 x 10 (g = 9.8 m/s2 but 10 is close and easier)
= 500 Newtons
P = F x d / t
= 500 x 5 /7
= 357 Watts
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoPower Output= 285 Watts.
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