In the following, assumption is made that the total kinetic energy of the two bodies after the impact is equal to their total kinetic energy before the collision. Consider two bodies, denoted by subscripts 1 and 2. Let :

This article deals with the computation of \(\vec{v_1}\) and \(\vec{v_2}\) according to \(m_1\), \(\vec{u_1}\), \(m_2\), \(\vec{u_2}\), \(x_1\), \(y_1\), \(x_2\) and \(y_2\).