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4 September, 09:56

A firework rocket is shot upward at a rate of 640ft/sec. Use the projectile formula h = - 16t^2 + v0t to determine the times when the height of the firework will be 1,200 feet. Round your answer to the nearest whole number.

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  1. 4 September, 09:58
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    2 seconds and 38 seconds

    Step-by-step explanation:

    h=-16t²-vot

    1,200=-16t²-640t

    turn this into standard form

    16t²-640t+1200=0

    now plug thes numbers into the quadratice formula

    a 16 b - 640 c 1200

    solve with quadratic formula to get ≅2 and ≅38 seconds
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