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28 June, 15:49

Which of the following is a complete description of the velocity of an object in motion?

A train travels due west at 90 km/h.

A 7 kg bowling ball rolls a distance of 20 m in 3 s.

A runner jogs 6 km/h for 10 minutes.

Birds fly 600 km south for the winter.

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  1. 28 June, 16:17
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    A train travels due west at 90 km/h.

    Explanation:

    In order to give the complete description of velocity, we need to recall that velocity is a vector quantity. We must have both magnitude and direction for a vector quantity.

    Since, velocity is a vector, it should have both magnitude and direction.

    The magnitude of velocity is given in km/h or m/s.

    Here, only the first option has magnitude of 90 km/h and direction as west.

    So, the first option is the correct one.
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