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Q.

‘n’ identical cubes each of mass ‘m’ and edge ‘L’ are on a floor. If the cubes are to be arranged one over the other in a vertical stack, the work to be done is

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a

Lmng (n-1)/2

b

Lg(n-1)/mn

c

(n-1)/Lmng

d

Lmng/2(n-1)

answer is A.

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Detailed Solution

Ui=nmgL2, Uf=nmgnL2, W=Ui-Uf

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