The derivative of position function gives the velocity function.

`v(t) = (ds(t))/dt`

The derivative of the velocity function gives acceleration function.

`a(t) = (dv(t))/dt`

`s(t)=4t^3-9t+13`

`v(t) = (ds(t))/dt`

`v(t) = 12t^2-9`

`a(t) = (dv(t))/dt`

`a(t) = 24t`

*So;*

** Velocity function **`v(t) = 12t^2-9`

** Acceleration function **`a(t) = 24t`

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