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.

Question

Ellen Franco

Physics

30 August, 05:21

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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Answers (1)

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Jacquelyn Hooper · Answer 1

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)