A rock, under the pull of gravity, has its height function given by:
$f(t) = -16t^2 + 10t + 155$
where $t$ is measured in seconds from the time it was released, and $f(t)$ represents its height above the
ground (in feet).
Initially, was the rock dropped, thrown straight upward, or thrown straight downward?
Thrown straight upward
Dropped
Thrown straight downward