Two equal masses $m_1$ and $m_2$ moving along the same straight line with velocities $+3 \, m/s$ and $-5 \, m/s$ respectively collide elastically. Their velocities after the collision will be respectively
- A$+4 \, m/s$ for both
- B$-3 \, m/s$ and $+5 \, m/s$
- C$-4 \, m/s$ and $+4 \, m/s$
- D$-5 \, m/s$ and $+3 \, m/s$
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