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COM of Center of Masses

Find the PE o...

Question

Find the PE of three objects of masses 1 kg, 2kg and 3 kg placed at the three vertices of anequilateral triangle of side 20 cm

A

50G J

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B

-55G J

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C

5G J

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D

60G J

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Solution

The correct option is A -55G J
$∵ 20 c m / 100 = 0.2 m$
$P E = \frac{- G (1) (2)}{0.2} - \frac{G (2) (3)}{0.2} - \frac{G (1) (3)}{0.2}$
$= - 10 G - 30 G - 15 G$
$= - 55 G .$
Hence,
option $(B)$ is correct answer.

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