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Two masses \( m_{A} \) and \( m_{B} \) moving with velocities \( v_{A} \) and \( v_{B} \) in opposite directions collide elastically. After that the masses \( m_{A} \) and \( m_{B} \) move with velocity \( v_{B} \) and \( v_{A} \) respectively. The ratio \( \left(m_{A} / m_{B}\right) \) is
[AFMC 2002; RPMT 2003]
(a) 1
(b) \( \frac{v_{A}-v_{B}}{v_{A}+v_{B}} \)
(c) \( \left(m_{A}+m_{B}\right) / m_{A} \)
(d) \( v_{A} / v_{B} \)
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