A rock is thrown straight up from level ground with its position above ground at any
Chapter 6, Problem 6.1.1.226(choose chapter or problem)
A rock is thrown straight up from level ground with its position above ground at any time \(t \geq 0\) given by \(x=5, y=-16 t^{2}+80 t+7\), At what time will the rock be 91 ft above ground?
(A) 1.5 sec (B) 2.5 sec
(C) 3.5 sec (D) 1.5 sec and 3.5 sec
(E) The rock never goes that high.
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