Question: A rock is projected directly upward from ground level. After t seconds, its height (if air resistance is neglected) is modeled by the function Why

A rock is projected directly upward from ground level. After t seconds, its height (if air resistance is neglected) is modeled by the function


f(t)=16t + 256t.


Why does the question in Exercise 54 have two answers?



Data from in Exercise 54


After how many seconds will it be 240 ft above the ground?

f(t)=16t + 256t.

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