A boy whose mass is 40kg finds that he can run up a flight of 50 steps each of 15cm high in 5s. How much power is required for the boy to run up a flight assuming that g is 10m/s.
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Answer:
work Done can be calculated as
W = F * d
= m * g * d
= 40 * 10 * 50 *10
= 20000
= 20 K joule
thus 20 K J of work is done by the boy
Power Dissipated can be calculated as
P = W / t
= 20 /5
= 4 K Watt
thus power dissipated is 4 KW
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