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For anobject moving along X - axis the...

For anobject moving along X - axis the position , is given by `S = a + bt^(2)`. Calculate its velocity at time t = 0 and t = 3 s, if value of a = 8 m and `b = 3 ms^(-2)`. Also calucate the average velocity between time interval t = 3 and t = 6s.

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