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Three masses m, 2m, and 3m are arranged in two triangular configurations as shown in figure 1 and figure 2. Work done by an external agent in changing the configuration from figure 1 to figure 2 is.

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$\frac{6 G m^{2}}{a} [2 - \frac{6}{\sqrt{2}}]$

$- \frac{G m^{2}}{a} [6 - \frac{6}{\sqrt{2}}]$

$- \frac{G m^{2}}{a} [6 + \frac{6}{\sqrt{2}}]$

answer is D.

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Detailed Solution

$W = U_{f} - U_{i}$

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