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