# HELP! Velocity and cliffs

*label*Mathematics

*timer*Asked: Apr 12th, 2015

**Question description**

A rocket is launched from the top of a 70 foot cliff with an initial velocity of 120 feet per second. The height, h, of the rocket after t seconds is given by the equation h = -16^2+120t+70. How long after the rocket is launched will it be 30 feet from the ground?