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?
a. Five seconds
b. Seven seconds
c. Nine seconds
d. 11 seconds

Answer 1

Break up the problem into two parts. Part 1 is the fire cracker from the top of the hill to it's peak. Then part 2 is the peak to ground level. Add those times together and you got the total flight time

^_^

Answer 2

is it a? @Demolisionwolf

Answer 3

@gabylovesu @triciaal @RosieF