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The position of an object moving along x...

The position of an object moving along x-axis is given by `x = a + bt^2` where `a=8.5 m, b=2.5 m s^-2 and t` is measured in seconds. What is its velocity at `t= 0 s and t = 2.0 s`. What is the average velocity between `t = 2.0 s and t = 4.0 s?`

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Given, `x=a+bt^(2),
wher, `a= 8.5 m` and `b=2.5 m//s^(2)`
:. Velocity, v9dx)/(dt) =d/9dt) (a+ bt^(2))`
At `
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