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A car moves along a straight line whose ...

A car moves along a straight line whose equation of motion is given by
`s=12t+3t^(2)-2t^(3)`
where s is in metres and t is in seconds. The velocity of the car at start will be :-

A

`7ms^-1`.

B

`9ms^-1`

C

`12ms^-1`.

D

`16ms^-1`.

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