Test students' ability to apply conservation of linear and angular momentum to solve two-dimensional elastic and inelastic collision problems for point masses and rigid bodies; include transformations to/from the center-of-mass frame, vector resolution of momentum, impulse calculations (including off-center impacts), use of the coefficient of restitution when appropriate, determination of post-collision linear and angular velocities, and verification of conservation laws and energy where applicable. Problems assume isolated, instantaneous collisions and require clear setup, diagrams, algebraic work, and numeric results.