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?

Answer 1

So t represents time and h(t) represents the height of the object at any time
So we set h(t)=0
\[0=-16t^2+85\]
Now solve for t