A body of mass 3 kg moving with a veloci...

A body of mass `3 kg` moving with a velocity of `4 m//s` towards left collides head on with a body of mass `4 kg` moving in opposite direction with a velocity of `3 m//s`. After collision the two bodies stick together and move with a common velocity which is

5m/sec towards right

12 m/sec towards right

12/5 m/sec towards left

zero

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