Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

AValderrama16

  • one year ago

A projectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = - 16t2 + 576t. After how many seconds does the projectile take to reach its maximum height? Show your work for full credit. i don't even understand what she is wanting me to do??????????

  • This Question is Closed
  1. goformit100
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    How ois the Physics question posted here @.Sam.

  2. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    math books have these types of questions as well

  3. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    its asking you for the vertex of the parabola

  4. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    if you can find the roots, you can determine the t value as the middle of the roots

  5. AValderrama16
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i Don't understand how to get to the vertex

  6. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    |dw:1371055357886:dw|

  7. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    can you find where the zeros for it are?

  8. AValderrama16
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    No

  9. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    then you are clearly not prepared to tackle this problem.

  10. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    can you factor the given equation?

  11. AValderrama16
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes i got to 16(t^2 + 36t)

  12. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    pull out a t as well

  13. AValderrama16
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    16t(t+36) = 16t (t+6) (t-6)

  14. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    16t (t+36) is as far as you can go now the key here is to remember your zero times tables ....

  15. AValderrama16
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay

  16. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    16t (-t+36) = 0 when 16t=0, or when -t+36 = 0 what values do we get for "t"?

  17. AValderrama16
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    if 16t=0 then t is 0 and if -t+36=0 then -t=-36

  18. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    good, so lets say it takes from t= 0 to 36 seconds to go up and come back down to the ground. (h=0) the great thing about a parabola is that it takes the same amount of time to go up as it does to go down. the highest point is therefore, half of the time interval. what is half way between 0 and 36 ?

  19. AValderrama16
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    18

  20. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    good, then it takes 18 seconds for it to reach its maximum position, and another 18 seconds to fall back down to the ground

  21. AValderrama16
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you :)

  22. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    good luck :)

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

    h(t)=-16t^2+576t \[\frac{ dh }{ dt }=-32t+576\] when it is at maximum height dh/dt =0 -32t+576=0,t=576/32=18 sec. when t=18 sec., h=-16*18*18+576=18(-16*18+32)=18*32(-9+1)=576*-8=-4608 maximum height reached=4608 units.

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

    • Attachments:

Ask your own question

Ask a Question
Find 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
  • 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.