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A body is moving along x axis mainlaing ...

A body is moving along x axis mainlaing the equation `x =8t - 3t^2`, If the x and t has units meter and second then at t = 1 sec, the instantenious velocity will be______.

A

`1 m//s`

B

`2 m//s`

C

`2.5 m//s`

D

`4.5 m//s`

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