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

anonymous · Answer

H(0)=150

150=-16(0)^2+v(0)+s

150=S

anonymous · Answer

your equation doesnt finish to find the answer...

anonymous · Answer

v= initial velocity

anonymous · Answer

so if you have

h(t)=-16t^2+110t+150

use quadratic formula to find when h(t)=0 aka the ball hitting the grond

anonymous · Answer

0=-16t^2+110+150

solve this equation