If an object is dropped from a height of 85 feet, the function h(t) = -16t^2+85 gives the height of the object after t seconds. Approximately,when will the object hit the ground?
A. 85.00 seconds
B. 69.00 seconds
C. 0.33 seconds
D. 2.30 seconds

Question

If an object is dropped from a height of 85 feet, the function h(t) = -16t^2+85 gives the height of the object after t seconds. Approximately,when will the object hit the ground? 
A. 85.00 seconds 
B. 69.00 seconds 
C. 0.33 seconds 
D. 2.30 seconds

jigglypuff314 · Answer

When    -16t^2 + 85 = 0    so you would have to solve for t :)
                        I suggest first subtracting 85 from both sides
                        then dividing both sides by Negative 16
                        then square rooting it :)