Question

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?

Answer 1

please help

Answer 2

im new and I need help

Answer 3

replace s = 140, v = 100, let the whole thing =0, solve for t

Answer 4

ok is that all I do

Answer 5

show work, please.

Answer 6

16t^2+vt+s
16t^2+100t+140=0
16^2+100t=140
is this right?

Answer 7

??