One particle has a mass of 2.64 x 10'3 kg and a charge of +6.99 pC. A second particle has a mass of 8.63 x 10'3 kg and the same charge. The two particles are initially held in place and then released. The particles y apart, and when the separation between them is 0.175 m, the speed of the 2.64 x 10'3 kg-particle is 129 m/s. Find the initial separation between the particles. "2.1: "Ln 4 92 (12 q] '1']. _>