Two equally charged particles are held 3.2X10^-3m apart and then released from rest. The initial acceleration of the first particle is observed to be 7.0m/s^2 and that of the second to be 9.0m/s^2. If the mass of the first particle is 6.3X10^-7kg, what are (a) the mass of the second particle and (b) the magnitude of the charge of each particle?