FAN AND MEDAL! please help! A firecracker shoots up from a hill 140 feet high, with an initial speed of 100 feet per second. Using the formula H(t) = -16t2 + vt + s, approximately how long will it take the firecracker to hit the ground?

Question

anonymous · Answer

use the formula and plug in numbers.. $$-16^{2}+(v)(100)+140$$
the formula for velocity is $$Velocity=\frac{ Distance }{ Time }$$

anonymous · Answer

$$-16(100)^{2}+v(100)+140$$

anonymous · Answer

I keep getting some insanely large number :/