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11 January, 08:38

A train travels due south at 20 m/s. It reverses its direction and travels due north at 20 m/s. What is the change in velocity of the train? 50 m/s, due south e50 m/s, due north 120 m/s, due south zero ms 40 m/s, due north

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  1. 11 January, 11:56
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    40 m/s due north

    Explanation:

    Consider that the south direction a negative Y axis and north direction as + Y axis

    v1 = 20 m/s South = 20 (-j) m/s

    v2 = 20 m/s North = 20 j m/s

    Change in velocity = v2 - v1 = 20 j - 20 (-j) = 40 j m/s

    So, change in velocity is 40 m/s due north.
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