algebra

if an object is dropped from a height of 85 feet the function h(t)=-16t+85 gives the height of an object after t seconds aproximately, when will the object hit the ground
A. 85 seconds
B. 69 seconds
C. 0.33 seconds
D. 2.30 seconds***

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  1. the equation is wrong. It should be
    h(t) = -16t^2+85
    h=0 when t^2 = 85/16 = 5.3
    so, t = 2.30
    you are correct

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    oobleck

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