Posted by pranshu on Wednesday, December 22, 2010 at 11:35pm.
a man whose mass is 75 kg walks up to 10 steps, each 20 cm high, in 5sec .what is the work done?

11th grade  SraJMcGin, Wednesday, December 22, 2010 at 11:46pm
Please select the correct School Subject so a teacher of that subject will read and answer your post.
Sra

physics  drwls, Thursday, December 23, 2010 at 12:17am
The work done does not depend upon how long it takes. (But the POWER does). Work is the product of mass, the acceleration of gravity, and the elevation gain.
In your case, that is
W = M g H = 75 kg*9.8 m/s^2*2.0 m
= 1470 Joules
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