After a head-on elastic collision between two balls of equal masses,one is observed to have a speed of $3 \, m/s$ along the positive $x$-axis and the other has a speed of $2 \, m/s$ along the negative $x$-axis. The original velocities of the balls are:
- A$-2 \, m/s$ and $+3 \, m/s$
- B$+2 \, m/s$ and $+3 \, m/s$
- C$-3 \, m/s$ and $+2 \, m/s$
- D$+3 \, m/s$ and $-2 \, m/s$
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