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The function y=-16t squared+486 models the height y in feet of a stone t seconds after it is dropped from the edge of a vertical cliff. How long will it take the stone to hit the ground? Round to the nearest hundredth of a second.

2007-01-16 08:23:52 · 3 answers · asked by nisha10mabry 3 in Science & Mathematics ➔ Mathematics

3 answers

Set y = 0, because after t seconds, the stone will be at height = 0 feet off the ground. The rest is pure algebra.

0 = -16t² +486 ---> -486 = -16t ---> -486 / -16 = t.

You can take it from here.

2007-01-16 08:38:37 · answer #1 · answered by MathBioMajor 7 · 0⤊ 0⤋

What is that question dude?

2007-01-16 16:30:00 · answer #2 · answered by Άγγελος 2 · 0⤊ 0⤋

thats not all of the question!!

2007-01-16 16:32:17 · answer #3 · answered by gemini52 3 · 0⤊ 0⤋