A firecracker shoots up from a hill 150 feet high with an initial speed of 95 feet per second. Using the formula H(t) = −16t2 + vt + s, determine how long it will take the firecracker to hit the ground.

Question

turingtest · Answer

What is the height H(t) when the firecracker hits the ground?
What is v?
What is s?
Plug in the numbers and solve for t.

anonymous · Answer

only problem is i know what v satnds for which is velocity but its not stated in the problem

turingtest · Answer

I quote from your problem:
 "an initial speed of 95 feet per second"

anonymous · Answer

so if 95 is the velocity what is the s a.k.a. the speed?

turingtest · Answer

No, actually "s" is used here for initial height. I know, I don't like that here very much either, but it is a common notation in physics.

Velocity and speed are very similar, but velocity has direction. In this problem the terms "velocity" and" speed" are interchangeable.

anonymous · Answer

ahhhhhh so  the H is unknown thank and and may the force be with you wise one

turingtest · Answer

To clear up: H is variable, not unknown really. You do know H when it hits the ground, right? If so you should be able to solve it.