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If `a=(3t^2+2t+1)` `m/s^2` is the expression according to which the acceleration of a particle varies. Then- `a=(3t^2+2t+1)` `(m)/(s^2)` Q. The change in velocity after 3 seconds of its start is:A. `30m//s`B. `39m//s`C. `3m//s`D. `20m//s`

Answer» Correct Answer - B
`V(t=0)=0`
`V_(t=3)=(3)^(3)+(3)^(2)+3`
`=27+9+3`
`=39`
`DeltaV=39-0=39m//s.`


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