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) = −16t^2 + vt + s, approximately how long will it take the firecracker to hit the ground?

Five seconds
Seven seconds
Nine seconds
11 seconds

Answer 1

The right answer for the question that is being asked and shown above is that: "Seven seconds." A firecracker shoots up from a hill 140 feet high, with an initial speed of 100 feet per second. Using the formula H(t) = −16t^2 + vt + s, approximately it will take Seven seconds for the firecracker to hit the ground.