Two particles, each of mass 7.0 kg, are a distance 3.0 m apart. To bring a third particle, with mass 21 kg, from far away to a resting point midway between the two particles, an external agent must do work equal to A 1.3 x 108J B 6.5 x 10.⁹ C -6.5 x 10.⁹ D -4.4 x 10.⁹ € -1.3 x 108
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