Two equally charged particles are held 3.2 x 10^3 m apart and then released from rest. The initial acceleration of the first particle is observed to be 7.0 m/s^2 and that of the second to be 9.0 m/s^2. The mass of the first particle is 6.3 x 10^7 kg.
(a) What is the mass of the second particle?
(b) What is the magnitude of the charge of each particle?