Two equal masses $m_1$ and $m_2$ are moving along the same straight line with velocities $+6 \mathrm

Question

Two equal masses $m_1$ and $m_2$ are moving along the same straight line with velocities $+6 \mathrm{~m/s}$ and $-2 \mathrm{~m/s}$ respectively. If they undergo a perfectly elastic head-on collision, the velocity of the first mass ($m_1$) after the collision will be

Professor PC Thomas Classes · Answer

(b) : In a perfectly elastic one-dimensional collision between two bodies of equal mass, they simply exchange their velocities. Since the initial velocity of the second mass was $-2 \mathrm{~m/s}$, this becomes the final velocity of the first mass after the collision.