physics
posted by Anonymous .
a rocket is launched from atop a 105foot cliff with an initial velocity of 156 ft/s.The height of the rocket above the ground at time or t is given by h=16tsquared+156t+105. When will the rocket hit the ground after it is launched?

physics 
bobpursley
when is h= 0?
0=h(t)=16t^2 + 156t+105
solve for t.
Respond to this Question
Similar Questions

math
Please explain to work this: A rocket is launched from atop a 105foot cliff with an initial velocity of 156ft/s. the height of the rocket above the ground at time t is given by h= 16t^2 + 156t + 105. When will the rocket hit the … 
Math/calculus
a toy rocket is shot into the air at the top of a building so that its height above the ground t seconds after the rocket is launched is given by the formula h(t)= 3t cubed + 6t squared + 27t feet from liftoff until the rocket crashes … 
AlgebraB2
1. What is the value of n so that the expression x² + 12x + n is a perfect square trinomial? 
AlgebraB2
I need help with figuring out how to do these problems to get the right answer. Appreciate any help. Thanks. Multiple choice: 1. What is the value of n so that the expression x² + 12x + n is a perfect square trinomial? 
AlgebraB2
Thanks everybody, I got a solution for figuring out the answer (which is 36) to my first question. But I still need help with the other ones below. Any help would be appreciated: 2. What are the solutions of the equation x2 + 4x = … 
physics
A stationary rocket is launched vertically upward. After 4s, the rocket's fuel is used up and it is 225.6 m above the ground. At this instant the velocity of the rocket is 112,8 m/s. Then the rocket undergoes free fall. Ignore the … 
math
a model rocket is projected straight upward from the ground level. It is fired with an initial velocity of 192 ft/s. How high is the rocket after 10 seconds? 
Math
A rocket is launched from the top of a 50 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=16t^2 + 120t+ 50. How long after the rocket is launched … 
Math
A water rocket was launched from the ground, with an initial velocity of 32m/s. The rocket achieved a height of 44 m after 2 s of flight. The rocket was in the air for 6 s. Determine the quadratic functionthat models the height of … 
algebra
A rocket is launched from atop a 105ft cliff with initial velocity of 156 ft/s Height above ground a time t is given 16t^2 + 156t + 105 = h. When will it hit the ground after launch?