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29 August, 21:52

In last week's Homecoming victory, All Conference, the star halfback of South's football team, broke a tackle at the line of scrimmage and darted upfield untouched. He averaged 9.8 m/s for an 80-yard (73 m) score. Determine the time for Al to run from the line of scrimmage to the end zone.

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  1. 29 August, 22:36
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    the time is t = 7.45 s

    Explanation:

    In this problem we are going to suppose that the star halfback moved in a straight line. From that assumption we can say the following:

    ''He averaged 9.8 m/s ... '' so the average speed is 9.8 m/s

    '' ... for an 80-yard (73 m) score'' so the distance is 73 m

    There is an equation that relates average speed, distance and time in

    straight line movements with constant acceleration

    Average speed = Distance/time replacing the data

    9.8 m/s = 73 m/t

    t = 73 m / (9.8 m/s)

    t = 7.44897 s = 7.45 s

    Be aware to having the data in congruent units

    For example : average speed (mi/h); distance (mi) and time (h)
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