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The positon of an object moving along x-...

The positon of an object moving along x-axis is given by `x(t) = (4.2 t ^(2) + 2.6) m,` then find the velocity of particle at `t =0s and t =3s,` then find the average velocity of particle at t =0 s ` to `t =3s.

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`v (0) =0 ms ^(-1), v (3) = 25.2 ms ^(-1) and bar v = 12.6 ms ^(-1)`
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