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The acceleration fo a body in ms^-2 star...

The acceleration fo a body in `ms^-2` starting from rest varies with time in secnds as per the relation `a = 3t + 4` then the magnitude of velocity of the body at t=2 s will be :

A

`14 ms^-1`

B

`16 m s^-1`

C

`12 m s^-1`

D

`10 m s^-1`.

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