Two particles 1 and 2, each carrying \(71 \mathrm{pC}\) of charge, are released from rest on a nonconducting, low-friction track. Particle 1 accelerates initially at \(7.0 \mathrm{~m} / \mathrm{s}^{2}\). Particle 2 , which has a mass of \(0.49 \mathrm{mg}\), accelerates initially at \(9.0 \mathrm{~m} / \mathrm{s}^{2}\).

(a) What is the mass of particle 1 ?

(b) What is the separation distance between the particles at the instant they are released?