An oblique collision occurs when two objects collide at an angle, causing them to bounce off each other with velocities that have both x and y components. In elastic collisions, both momentum and kinetic energy are conserved.
Where m₁ and m₂ are masses, v₁ and v₂ are velocities, and e is the coefficient of restitution (0 = perfectly inelastic, 1 = perfectly elastic).