A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

If a baseball player hits a baseball from 4 feet off the ground with an initial velocity of 64 feet per second, how long will it take the baseball to hit the ground? Use the equation h = -16t2 + 64t + 4.

  • This Question is Closed
  1. welshfella
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    when the ball hits the ground h will = 0 so form an equation and solve for t

  2. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    So far I have this 64 +/- sqrt 3840 over 32. But I don't know what to do after that

  3. welshfella
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    make it easier by taking out -4 -4(4t^2 - 16t - 1) = 0 now apply quadratic formula to the expression in the parentheses t =[ 16 +- sqrt(256 - 4*4 * -1) ] / 8

  4. welshfella
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    t = (16 + 16.49) / 8 (neglect the negative root)

  5. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    im confused

  6. welshfella
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    haven't you used the quadratic formula before?

  7. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes but I didn't get what you got

  8. welshfella
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    i applied it to 4x^2 - 16x - 1 = 0

  9. welshfella
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    - smaller numbers

  10. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh ok

  11. welshfella
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    i divide through by -4 to make it easier

  12. welshfella
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    this equation will have the same roots as the bigger one

  13. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so the answer I got was 16+/- sqrt 17 over 2 is that what you got?

  14. welshfella
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    (16 + sqrt272 ) / 8 = 4.06 secs

  15. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    my answer has to be in the quadratic formula

  16. welshfella
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    oh ok so that's (16 + sqrt(16*17) ) / 8 = 16 + 4*sqrt17 ----------- 8 = 2 + 0.5 sqrt17

  17. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok thank you

  18. welshfella
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    yw

  19. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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
  • 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.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.