Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

allie_bear22

The height in meters of a projectile can be modeled by h = -4.9t^2 + vt + s where t is the time (in seconds) the object has been in the air, v is the initial velocity (in meters per seconds) and s is the initial height (in meters). A soccer ball is kicked upward from the ground and flies through the air with an initial vertical velocity of 4.9 meters per second. After how many seconds does it land approximately?

  • 11 months ago
  • 11 months ago

  • This Question is Closed
  1. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    When it lands, what height does it have?

    • 11 months ago
  2. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    Wrong way to phrase it... Let me rephrase.... How high is the ball when it lands?

    • 11 months ago
  3. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    4.9?

    • 11 months ago
  4. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    When it lands, is it 4.9 meters above the ground?

    • 11 months ago
  5. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    i have no idea

    • 11 months ago
  6. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    what do i have to do to get the answer?

    • 11 months ago
  7. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    Start with that... find the height of the ball as soon as it lands. It just takes a little intuition and visualization :)

    • 11 months ago
  8. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    -16

    • 11 months ago
  9. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    So... when the ball lands, it is 16 meters underground?

    • 11 months ago
  10. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    yupp

    • 11 months ago
  11. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    or no 16

    • 11 months ago
  12. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    16 means when the ball lands, it is 16 meters above the ground (in mid-air). Does that seem reasonable?

    • 11 months ago
  13. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    no.

    • 11 months ago
  14. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    Then... what is reasonable? When the ball lands, its height is...?

    • 11 months ago
  15. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    5f

    • 11 months ago
  16. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    What's f?

    • 11 months ago
  17. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    didnt mean to put tht srry

    • 11 months ago
  18. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    Well... you mean to tell me that when the ball *lands* it is 5 meters above the ground, then?

    • 11 months ago
  19. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    omg!! i really dont kno

    • 11 months ago
  20. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    Think... meditate... :P Now... how high is the ball when it LANDS... how many meters above the ground is the ball when it LANDS...

    • 11 months ago
  21. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    hmmm 0?

    • 11 months ago
  22. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    Yes. Finally :P

    • 11 months ago
  23. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    yay!!!! that was easy lol

    • 11 months ago
  24. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    Of course, when the ball lands, it is on the ground. Thus, it is 0 meters above the ground.

    • 11 months ago
  25. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    0 is not the answer. -.-

    • 11 months ago
  26. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    that's just a stepping stone...

    • 11 months ago
  27. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    oh ok wat next?

    • 11 months ago
  28. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    We need v and s. We already have v, the initial velocity, 4.9

    • 11 months ago
  29. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    What's the initial height (s) ?

    • 11 months ago
  30. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    4.9^2

    • 11 months ago
  31. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    Are you guessing? I strongly advise against it... it's too risky.

    • 11 months ago
  32. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    And no, the initial height is not \(\ 4.9^2\)

    • 11 months ago
  33. allie_bear22
    Best Response
    You've already chosen the best response.
    Medals 0

    ok thnx for your help ill do the rest by myself :) thnx

    • 11 months ago
  34. terenzreignz
    Best Response
    You've already chosen the best response.
    Medals 1

    Are you sure? Well, if you're sure, post your answer here.

    • 11 months ago
    • Attachments:

See more questions >>>

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.