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Two equally charged particles, held 3.8 x 10-3 m apart, are released from rest. The initial acceleration of the first particle is observed to be 5.8 m/s2 and that of the second to be 10 m/s2. If the mass of the first particle is 8.1 x 10-7 kg, what are (a) the mass of the second particle and (b) the magnitude of the charge of each particle?

A nudge in the right direction would be helpful...I have the mass of one particle, and acceleration. And distance between two particles, so I can find r2. But I am stumped how mass comes into things. All I can think of is F=ma.