MEDAL + FAN!

A firecracker shoots up from a hill 150 feet high, with an initial speed of 110 feet per second. Using the formula H(t) = −16t^2 + vt + s, approximately how long will it take the firecracker to hit the ground?

Question

MEDAL + FAN!

A firecracker shoots up from a hill 150 feet high, with an initial speed of 110 feet per second. Using the formula H(t) = −16t^2 + vt + s, approximately how long will it take the firecracker to hit the ground?

anonymous · Answer

A. Eight seconds
B. Nine seconds
C. 10 seconds
D. 11 seconds

anonymous · Answer

I got A but I'm not sure if it's right :/

anonymous · Answer

it's right

anonymous · Answer

it's right

anonymous · Answer

Thank you guys so much! Since I can't medal you both, I'll fan you both :)

anonymous · Answer

It was right btw (if anyone wants to know in the future)