Two bodies of masses $$m_1=2\,\text{kg}$$ and $$m_2=1\,\text{kg}$$ are moving towards each other in the same straight line with speed $$12\,\text{m s}^{-1}$$ and $$6\,\text{m s}^{-1}$$ respectively as shown in the figure. The bodies can be assumed as point masses. After some time, the two bodies undergo elastic collision. After the collision

A

The two bodies merely exchange their velocities

B

$$m_1$$ comes to rest

C

$$m_2$$ moves with speed $$18\,\text{m s}^{-1}$$ towards right

D

$$m_1$$ and $$m_2$$ move with same speeds but they reverse their directions of motion