Gravitational Potential Energy of a System
Five identical masses, each of mass $m$, are positioned at the vertices of a regular pentagon with a side length of $s$. Which of the following expressions represents the total gravitational potential energy, $U$, of this system of masses?
A
U = -10Gm²/s
B
U = -Gm²/s × (5 + 5/φ)
C
U = -Gm²/s × (5 + 5/sin(72°))
D
U = -5Gm²/s
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