Posted by **Bowwow4** on Monday, February 28, 2011 at 9:02am.

Lars, of mass 75.6 kg, has been working out and can do work for about 2.0 min at the rate of 0.980 hp (731 W). How long will it take him to climb three flights of stairs, a vertical height of 11.0 m?

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**Henry**, Tuesday, March 1, 2011 at 11:39pm
Fl = mg = 75.6kg * 9.8N/KG = 740.88N =

Lars force.

P = F * d/t,

P = 740.88 * (11/t) = 731W,

8149.68 / t = 731,

t = 8149.68 / 731 = 11.15s.

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