A particle of mass m scatters off a second particle with mass M according to a potential U(r) = α r 2 , α > 0 Initially m has a velocity v0 and approaches M with an impact parameter b. Assume m M, so that M can be considered to remain at rest during the collision. 1. Find the distance of closest approach of m to M. 2. Find the laboratory scattering angle. (Remember that M remains at rest.)