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10 November, 06:07

The average speed of an object (in feet per second) is determined by the equation S=4√d, where d is the distance in feet the object is dropped. If a rock dropped from the top of a bridge reaches an average speed of 60 ft / sec, how high is the bridge?

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  1. 10 November, 08:18
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    The bridge i s 225ft high.

    Step-by-step explanation:

    The average speed is determined by the equation,

    S = 4√d

    Here S is the average speed and d is the height from where the object is dropped.

    Average speed = 60 ft. per second

    S = 4√d

    60 = 4√d

    √d = 60/4

    √d = 15

    d = 225ft.

    The object is dropped from 225ft. height.
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