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Three similar cubical slabs of mass m n edge b are lying on ground work done to arrange them one over other

10 months ago

Arun
24498 Points

Work done in placing first cube is 0.
Work done in placing 2nd cube is mgl.
Similarly, W3=2mgl,.....,Wn=(n-1)mgl.
Wnet= W1+W2+W3+......+W(n-1)
= mgl{1+2+3+....+(n-1)}
= mgl{Sn}
= mgl{(n-1)/2 [2×1+(n-1-1)1]}
= mgl{(n-1)/2×n}
Wnet = mgln(n-1)/2.

Put here n = 3
10 months ago
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