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Two point charges of 30 nC and – 40 nC are held fixed on an x-axis at the origin and
at x = 72 cm, respectively. A particle with a charge of 10 μC is released from rest at
x = 30 cm. If the initial acceleration of the particle has a magnitude of 12.5 × 103 m/s
2
,

find the mass of the particle.