Question

Two particles, each of mass m, are a distance dapart. To bring a third particle, with mass 2m, from far away to a resting point midway between the two particles,an external agent must do work equal to:
A) 4Gm2/d
B) -4Gm2/d
C) 8Gm2/d
D) -8Gm2/d
E) zero

Answer

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