# Illustration Head-on Elastic Collision Between Heavy and Light Ball at Rest

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Head-on elastic collision of two balls. Before the collision, the first (red) ball has the velocity $$v_1 = 0$$, which means: The ball is at rest. The second (blue) ball has the velocity $$v_2$$ to the left. The mass $$m_1$$ of the first ball is negligible compared to the mass $$m_2$$ of the second ball.

The two balls collide head-on. After this collision, the first ball gets twice the speed of the second ball: $$v'_1 \approx 2v_2$$ and the second ball keeps its velocity: $$v'_2 \approx v_2$$.