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A car moves-alyng a straight line whose ...

A car moves-alyng a straight line whose equation of motion is given by` S= 12t+3t^2-2t^3`.where s is in meter and t is in second. The velocity of the car at start will be:

A

`7 m//s`

B

`9 m//s`

C

`12m//s`

D

`16 m//s`

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