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March 27, 2017

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if a rock is dropped from the top of a 200 ft building, solve for the time it takes for it to hit the ground. (when h=0)
hint-initial velocity when dropped is 0

  • algebra 2 - ,

    in non-metric units

    h = -16t^2 + 0t + 200 , where t is in seconds and h is in feet

    so when it hits the ground , h = 0
    so 0 = -16t^2 + 200
    16t^2 = 200
    t = √(200/16) = 10√2/4
    = 5√2/2 or appr 3.54 seconds

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