Kinetic energy is the [[Energy|energy]] associated with [[General Motion|motion]]. $\Delta K=\dfrac{1}{2}∑m_ev_e^2−\dfrac{1}{2}∑m_iv_i^2$ Where: - $\Delta K$ is the change in kinetic energy - $m_e$ and $m_i$ are the final and initial [[Mass|masses]] of the system respectively - $v_e$ and $v_i$ are the final and initial [[Velocity|velocities]] of the masses respectively