**A**

Let t_{1 }be 2s, t_{2 }be 5s

The velocity after 2 seconds is

**V=a ∙ t _{1}**

V=4∙2=8(m/s)

The final velocity is equal to velocity after 2 seconds, because during last 5 seconds the velocity was constant.

*So the answer is:*

The final velocity is 8 m/s

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