3. A 1.5 MeV iron atom (particle 1) collides with an initially stationary iron atom (particle 2). a. Prior to the collision, what is the center-of-mass velocity? (2 points) b. Prior to the collision, what is the speed of particle 2 relative to the center-of-mass? (2 points) c. Following the collision, what is the new center-of-mass velocity? (2 points) d. Assuming coulomb potentials adequately describe the interaction, how close do the two particles get? (4 points)