69. The kinematic equation of motion of a point along a

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69. The kinematic equation of motion of a point along a straight line (axis x) is given by x = A + Bt + Ct2 + Dt3, where B = 9 m / s; C = -6 m / s2; D = 1 m / s3. Determine the average velocity <υ> and the average acceleration of a material point in the time interval during which the point moves in the opposite direction of the original.
Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)