$A$ body of mass $2 \ kg$ moving with a velocity of $3 \ m/s$ collides head-on with a body of mass $1 \ kg$ moving with a velocity of $4 \ m/s$ in the opposite direction. After the collision,the two bodies stick together and move with a common velocity:
- A$\frac{1}{4} \ m/s$
- B$\frac{1}{3} \ m/s$
- C$\frac{2}{3} \ m/s$
- D$\frac{3}{4} \ m/s$
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