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Particle 1 with a mass of 15.0 kg is fixed at the origin. Particle 2 is...

Particle 1 with a mass of 15.0 kg is fixed at the origin. Particle 2 is fixed on the +x axis 20.0 cm away from the origin. Particle 3 with a mass of 25.0 kg sits between particles 1 and 2, 5.00 cm away from the origin. Point P is midway between particles 1 and 2. What is the mass of particle 2 if the magnitude of the net gravitational field at point P is zero?

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