Question

The function y = –16t2 + 224 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.

Answer 1

hint, when it hits the ground, the height will be 0

Answer 2

in other words set
\[-16t^2+224=0\] and solve for \(t\) in three steps
1) add \(16t^2\) to both sides
2) divide by 16
3) take the square root

Answer 3

The function y = –16t2 + 224 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. (1 point)
(0 pts) 0.25 seconds
(0 pts) 5.29 seconds
(0 pts) 7.48 seconds
(1 pt) 3.74 seconds
1 /1 point