An atom of mass m1 = m moving in the x direction with speed v1 = v collides elastically with an atom of mass m2 = 5m at rest. After the collision the first atom moves in the y direction. Find the direction of motion of the second atom. ________ ° counterclockwise from the +x-axis Find the speeds of both atoms (in terms of v) after the collision. v'1 = ________ v v'2 = ________ v 3. The attempt at a solution (a) arctan(5) = 78.7/2 = -39.4° counterclockwise from the +x-axis (b) tan(39.4) = .821 v = v'2 I don't know what formulas/equations to use here and am unsure on how to get v'2. I have worked out the correct answers for (a) and the first part of (b).