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Math·Advanced Math·Nonlinear functions

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The function $h(t)=-16t^2+b$ estimates an object’s height, in feet, above the ground $t$ seconds after the object is dropped, where $b$ is a constant. The function estimates that the object is 43.56 feet above the ground when it is dropped at $t=0$. How many seconds after being dropped does the function estimate the object will hit the ground?

1

1.65