A firecracker shoots up from a hill 150 feet high with an initial speed of 110 feet per second. Using the formula H(t) = −16t2 + vt + s, approximately how long will it take the firecracker to hit the ground?

8 seconds

9 seconds

10 seconds

11 seconds

Question

A firecracker shoots up from a hill 150 feet high with an initial speed of 110 feet per second. Using the formula H(t) = −16t2 + vt + s, approximately how long will it take the firecracker to hit the ground?
 
8 seconds 

9 seconds 

10 seconds 

11 seconds

nubeer · Answer

hmm what is "s" and v in your equation?

anonymous · Answer

no clue

nubeer · Answer

well H(t) might be the height but that s dont know maybe the displacement.. it is.. but untill we dont know what it is no one can help.

nubeer · Answer

v is the speed.. so still need to see what is s

anonymous · Answer

ok, well this is jus how the problem came. im ugessing if u dont know how to do it, then im js screwed :(

anonymous · Answer

*guessing

anonymous · Answer

@nubeer s is the initial height and v is the initial velocity, i looked it up

nubeer · Answer

sorry had so many notif didn't saw urs untill u tagged me up. let me see if i can figure out.