A ball of mass 2 kg travelling at 8 m/s strikes...

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A ball of mass 2 kg travelling at 8 m/s strikes a ball of mass 4 kg travelling at 2m/s. After collision both balls move at the same velocity 'v'. What is magnitude of velocity 'v'?

7 m/s

4 m/s

5 m/s

6 m/s