Solve this numerical.... A 55 kg man holds a weight of 20 kg on his head. What is the work done by him against gravity if he moves a distance of 20 m (1) on a horizontal road, (2) on an incline of 1 in 5? Take g = 10ms-2
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9
if he walks on horizontal road
the angle between his motion and force(weight) applied is 90°
so work done = 0
the angle between his motion and force(weight) applied is 90°
so work done = 0
Answered by
9
Total mass = 55+20. => 75 kg
S = 20 m
I) Work done on a horizontal road is zero. His mass and the load mass apply their force downwards, while the movement is horizontal.
II) Work done on the inclined plane
W = mgh
W = 75×10×4
W = 3000J
By Sonam Tyagi
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