A ball of mass $200\mathrm{g}$ moving with a velocity of $8\mathrm{m}/\mathrm{s}$ collides and sticks with another ball of mass $300\mathrm{g}$ moving in the same direction with velocity $4\mathrm{m}/\mathrm{s}$. What is the common velocity of the balls after the collision?

A. $5.6{\mathrm{ms}}^{-1}$  
B. $2.8{\mathrm{ms}}^{-1}$
C. $11.2{\mathrm{ms}}^{-1}$
D. $1.4{\mathrm{ms}}^{-1}$

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Correct Answer: A