DYNAMICS : Graphical Solution-solved example(الحركة في خط مستقيم -الحل البياني)

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The s-t graph for a train has been experimentally determined. From the data, construct the v-t and a-t graphs for the motion; 0 … t … 40 s. For 0 … t … 30 s, the curve is s = (0.4t2) m, and then it becomes straight for t Ú 30 s