11th grade
posted by pranshu .
a man whose mass is 75 kg walks up to 10 steps, each 20 cm high, in 5sec .what is the work done?

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Sra 
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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