The height above ground level in meters of missile launched vertically is given by. h(t)= -16tcupe plus 100t.
At what time is the missile 72m above ground level? (t is time in second)

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  1. given your equation, just solve
    -16t^3 + 100t = 72
    However, the trajectory of a missile is a parabola, so you want

    -16t^2 + 100t = 72
    or, dividing by -4,
    4t^2 - 25t + 18 = 0
    just solve in the usual way.
    and the height is in feet, not meters. in metric units, g = 9.81, not 32.

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