Question

A golf ball is hit from the ground with an initial speed of 192 feet per second. Assume the starting height of the ball is 0 feet. How long will it take the golf ball to hit the ground?

Answer 1

12 secs
19 secs
39 secs
6 secs

Answer 2

What equation models this? It is impossible otherwise, unless we are suppose to draw from other models.

Answer 3

Remember that the equation of the motion
\[
s(t) = -\frac 12 g t^2 + v0 t + s0
\]
Where g=9.8; v0=192 and s0 =0
It is clear that t=0 the ball is on the ground.
What other values make s(t)=0.
In other words, solve s(t)=0 for t. And you are done.