The position of an object moving along t...

The position of an object moving along the x axis is given by `x = a + bt^2` where a = 8.5 and b= 2.5 m` s^2` and t is measured in second. What is the velociity at t=0 s and t= 2s? What is the average velocity between t= 2 s and t=4s?

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