Two particles with identical positive charges separated by \(2.5 \mathrm{~cm}\) are released from rest on a nonconducting, lowfriction track. Immediately after release, one particle, which has a mass of \(10 \mathrm{mg}\), has an acceleration of magnitude \(5.0 \mathrm{~m} / \mathrm{s}^{2}\), while the other particle has an acceleration of magnitude \(9.0 \mathrm{~m} / \mathrm{s}^{2}\). Find 

(a) the mass of the second particle 

(b) the charge on each particle.