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21 July, 02:54

A hang glider flew to an altitude of 10000 feet. Fifteen minutes later, it's altitude was 7000 feet. What was the change in elevation per minute?

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  1. 21 July, 03:05
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    The speed is the change of distance over the change of time.

    s = (d - d1) / (t - t1)

    where the subscript 1 indicates as "initials."

    The initial time starts at zero. So,

    s = (7000 - 10000) / (15 - 0) = - 200 feet (elevation) per minute

    The value is negative because the hang glider flew downward.
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