question_answer

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 \[({{m}_{A}}/{{m}_{B}}\]) is        [RPMT 2003, AFMC 2002]

A)          1   

B)          \[\frac{{{v}_{A}}-{{v}_{B}}}{{{v}_{A}}+{{v}_{B}}}\]

C)          \[({{m}_{A}}+{{m}_{B}})/{{m}_{A}}\]

D)                       \[{{v}_{A}}/{{v}_{B}}\]