A ball of mass 2 kg travelling at $8 m s^–1$ strikes a ball of mass 4 kg travelling at $2 m s^–1$. Both balls are moving along the same straight line as shown. After collision, both balls move at the same velocity v. What is the magnitude of the velocity v?

$4ms^–1$
2 )
$5ms^–1$
3 )
$6ms^–1$
4 )
$8ms^–1$
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