Math

If an object is propelled upward from ground level with initial velocity of 55 feet per second, it's height h in feet t seconds later is given by the equation H=-16t^2+55t. after how many seconds does the object hit ground?

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  1. V = Vo + g*Tr = 0 @ max Ht.
    Tr = -Vo/g = -55/-32 = 1.72 s. = Rise time.

    Tf = Tr = 1.72 s. = Fall time.

    Tr+Tf = 1.72 + 1.72 = 3.44 s. To hit gnd

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