$A$ block of mass $m$ moving along a straight line with constant velocity $3 \vec{V}$ collides with another block of the same mass at rest. They stick together and move with a common velocity. The common velocity is:
- A$\frac{3 \vec{V}}{2}$
- B$2 \vec{V}$
- C$3 \vec{V}$
- D$\vec{V}$
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