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23 September, 23:57

A ball is thrown upward in the air, and its height above the ground after t seconds is H (t) = 57 t - 16 t 2 feet. Find the time t when the ball will be traveling upward at 14.25 feet per second.

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  1. 24 September, 00:06
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    1.34 seconds

    Explanation:

    h (t) = 57t - 16t²

    Velocity is the derivative of position with respect to time:

    v (t) = dh/dt

    v (t) = 57 - 32t

    When v = 14.25:

    14.25 = 57 - 32t

    32t = 42.75

    t = 1.34
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