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12 September, 06:48

A punter can kick a football with an initial velocity of 48 feet per second. How many seconds will it take for the ball to first reach a height of 32 feet?

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  1. 12 September, 07:00
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    It will take the ball 1 or 2secs to reach height of 32ft

    Step-by-step explanation:

    At maximum height, the final velocity of the object is zero. Using one of the equation of motion as shown;

    S = ut + 1/2gt²

    S is the height reached by the ball

    U is the initial velocity

    g is the acceleration due to gravity

    t is the time taken by the ball to reach maximum height.

    Since the object is kicked upward, g will be negative.

    Given the following details

    S = 32feet, U = 48ft/s g = - 32ft/s

    32 = 48t-1/2 (32) t²

    32 = 48t - 16t²

    16t²-48t+32 = 0

    t² - 3t+2 = 0

    t²-t-2t+2 = 0

    t (t-1) - 2 (t-1) = 0

    (t-1) (t-2) = 0

    t = 1 or 2seconds
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