The acceleration $a$ (in $ms ^{-2}$ ) of a body, starting from rest varies with time $t$ (in second) according to the relation $a=3 t+4$. The velocity of the body starting from rest at time $t=2 s$ will be $........ms ^{-1}$
- A$10$
- B$12$
- C$14$
- D$16$
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- [IIT 2005]
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