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[" A body moves in a straight line along X-axis,its distance "],[" from the origin is given by the equation "x=8t-3t^(2)" ,where "],[" a is in "m" and "t" is in s.Find the average velocity in the "],[" interval from "t=0" to "t=1s" and in the interval from "t=0" to "],[t=4s" ."quad [kin.5ms^(-1),-4ms^(-1)]]

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