A body moves along a straight line with uniform acceleration $a$. It covers $30\text{ m}$ in the first $3.0\text{ s}$ of its motion, and covers $50\text{ m}$ in the next $2.0\text{ s}$. What is the initial velocity $u$ of the body at the start of the first $3.0\text{ s}$?

• A$1.0\text{ m/s}$
• B$2.0\text{ m/s}$
• C$4.0\text{ m/s}$
• D$6.0\text{ m/s}$

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