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30 January, 10:49

A sprinter set a high school record in track and field, running 200.0 m in 21.7 s. What is the average speed of the sprinter in kilometers per hour?

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  1. 30 January, 13:17
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    Given dа ta:

    Distance travelled (d) = 200.0 m

    Time taken (t) = 21.7 s

    To determine:

    The average speed in km/hr

    Calculation:

    Convert distance from m to km

    1000 m = 1 km

    200.0 m = 1 km * 200.0 m/1000 m = 0.2 km

    Convert time from sec to hours

    3600 sec = 1 hour

    21.7 sec = 1 hour * 21.7 sec/3600 sec = 6.027 * 10^-3 hrs

    Speed is defined as the amount of distance travelled per unit time

    Speed = distance/time = 0.2 km/6.027*10^-3 hr

    = 33.18 km/hr (or 33.2 km/hr)
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