A person standing near the edge of a cliff 170 feet above a lake throws a rock upward with an initial speed of 80 feet per second. The height of the rock above the lake at the bottom of the cliff is a function of time and is described by
h(t) = -16t 2 + 80t + 170
-At what time will the rock hit the water? Round to two decimal places.

Question

A person standing near the edge of a cliff 170 feet above a lake throws a rock upward with an initial speed of 80 feet per second. The height of the rock above the lake at the bottom of the cliff is a function of time and is described by 
h(t) = -16t 2 + 80t + 170
-At what time will the rock hit the water? Round to two decimal places.

Quizplus · Accepted Answer

The Answer of A person standing near the edge of a cliff 170 feet above a lake throws a rock upward with an initial speed of 80 feet per second. The height of the rock above the lake at the bottom of the cliff is a function of time and is described by 
h(t) = -16t 2 + 80t + 170
-At what time will the rock hit the water? Round to two decimal places.

A Person Standing near the Edge of a Cliff 170