A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
Math help please!
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? (4 points)
Five seconds
Seven seconds
Nine seconds
11 seconds
anonymous
 one year ago
Math help please! 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? (4 points) Five seconds Seven seconds Nine seconds 11 seconds

This Question is Closed

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@Michele_Laino @ganeshie8

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i think the answer is 7 seconds

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Okay so here you have your equation H(t) = 16t2 + vt + s You are given the initial height = 140 = s And the initial speed = v = 100 ft/s 16 t^2 + 100 t + 140 = H(t) Since you want to find the time it took to hit the ground, you are looking for the x intercept. Set the equation equal to 0 then use the quadratic formula. 16 t^2 + 100 t + 140 = 0

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok i understand that but im unsure of how to solve it

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Do you know the quadratic formula?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes, so i would just use that?!!!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes. DO you see how the formula resembles a quadratic. The only difference is that it is a t and not an x

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0You should get 6.53. That rounds to 7.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.016 t^2 + 100 t + 140 = 0 I forgot the negative.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok yes i got that answer thanks so much!!!!!!! ;)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0do you mind helping with one more?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Darlene kicks a soccer ball off the ground and in the air, with an initial velocity of 34 feet per second. Using the formula H(t) = 16t2 + vt + s, what is the maximum height the soccer ball reaches? (4 points) 17.7 feet 18.1 feet 19.3 feet 20.2 feet Im getting 17.7 feet?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0height + velocity + gravity https://www.youtube.com/watch?v=K7bda1o3BY

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Well what do you know? What is your initial velocity and initial height?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0the velocity is 34 feet and i believe the unital height is 0 feet

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0assuming since the problem doesnt say

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yup. So plug them into the equation for v and s

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0H(t) = 16t2 + 34t + 0

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes so the answer would be 18.1 feet ??

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Thanks so much for walking me through it!!!!!!!
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.