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anonymous

  • one year ago

will fan and medal but need help ASAP!!

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  1. anonymous
    • one year ago
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    The function H(t) = -16t2 + vt + s shows the height H (t), in feet, of a projectile launched vertically from s feet above the ground after t seconds. The initial speed of the projectile is v feet per second. Part A: The projectile was launched from a height of 100 feet with an initial velocity of 60 feet per second. Create an equation to find the time taken by the projectile to fall on the ground. (2 points) Part B: What is the maximum height that the projectile will reach? Show your work. (2 points) Part C: Another object moves in the air along the path of g(t) = 20 + 38.7t where g(t) is the height, in feet, of the object from the ground at time t seconds. Use a table to find the approximate solution to the equation H(t) = g(t), and explain what the solution represents in the context of the problem? [Use the function H(t) obtained in Part A, and estimate using integer values] (4 points) Part D: Do H(t) and g(t) intersect when the projectile is going up or down, and how do you know? (2 points)

  2. pinklion23
    • one year ago
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    this is a unit test in math we can not help with tests :(

  3. anonymous
    • one year ago
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    what exactly are you having trouble with

  4. pinklion23
    • one year ago
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    she wants us to help her answer a test from k12 trust me i had the question before :(

  5. anonymous
    • one year ago
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    actualy no I do not go to k12

  6. anonymous
    • one year ago
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    if she asks about it in a right way, there is no problem to help getting to the solution

  7. anonymous
    • one year ago
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    and I was asking if you could check what I have so far.

  8. anonymous
    • one year ago
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    thats the right question

  9. pinklion23
    • one year ago
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    ok sounds good so what is the first question you have

  10. anonymous
    • one year ago
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    the equation that I cam up with for part a is h(t)=16(60)^2+100(60)

  11. anonymous
    • one year ago
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    I have the feeling that its wrong but I am not sure

  12. anonymous
    • one year ago
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    **came**

  13. pinklion23
    • one year ago
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    ok well i got tagged in something im sure myko can help you so good day : )

  14. anonymous
    • one year ago
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    ok, do you think you can help me @myko

  15. anonymous
    • one year ago
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    just ask and we will see

  16. anonymous
    • one year ago
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    the equation that I came up with for part a is h(t)=16(60)^2+100(60)

  17. anonymous
    • one year ago
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    did I do it right or is there an error

  18. anonymous
    • one year ago
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    Hmm. It is not correct. |dw:1432914354831:dw| The given equation represents the parabola openning downwards. Also it says that that will be the path folowed by the projectile if you take coordinate axis in a usual way. So imagine it being the actual trajectory of your particle. The parabola will cut t-axis in two points. One of them is the moment when it hits the ground, right?

  19. anonymous
    • one year ago
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    Yes

  20. anonymous
    • one year ago
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    |dw:1432914422577:dw|

  21. anonymous
    • one year ago
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    what can you say about the value of H(t) when the projectile hits the ground?

  22. anonymous
    • one year ago
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    Remmeber that H(t) represents the hight of the projectile

  23. anonymous
    • one year ago
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    So?

  24. anonymous
    • one year ago
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    You there?

  25. anonymous
    • one year ago
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    yeah I was just thinking

  26. anonymous
    • one year ago
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    for t would you plug in the distance or would it you you leave t as t?

  27. anonymous
    • one year ago
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    first answer about hte value of H(t) at the moment when it is on the ground

  28. anonymous
    • one year ago
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    remmember that it represents the hight. How much high is something from the ground if it is on the ground?

  29. anonymous
    • one year ago
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    0

  30. anonymous
    • one year ago
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    right, finaly :)

  31. anonymous
    • one year ago
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    sorry, I am really bad at algebra

  32. anonymous
    • one year ago
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    so your equation becomes: 0=-16t^2+vt+s Now lets use next information given. It says it was trown from 100 feet hight How we can introduce this informatyion in our equation?

  33. anonymous
    • one year ago
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    what does s represent?

  34. anonymous
    • one year ago
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    Actualy it represents initial hight. So substitute s=100

  35. anonymous
    • one year ago
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    and v=60 and you got the equation for t when it hits the ground

  36. anonymous
    • one year ago
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    sry, got to go now

  37. anonymous
    • one year ago
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    ok, so then what does t represent?

  38. anonymous
    • one year ago
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    ok well thank you you helped me understand it more now

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