The PE of three objects of masses 1kg, 2kg
and 3kg placed at the three vertices of an
equilateral triangle of side 20cm is
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The total potential energy will be 55G .
Explanation:
In this question there are three systems because each mass is located at the end of each side. So,
U1 = G m1m2/r = G(1)(2)/0.2 = 10G
U2 = G m2m3/r = G(2)(3)/0.2 = 30G
U3 = G m1m3/r = G(1)(3)/0.2 = 15G
Now the total energy will be:
U = U1 + U2 + U3
U = 10G + 30G + 15G
U = 55G
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