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allie_bear22 Group Title

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?

  • one year ago
  • one year ago

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  1. terenzreignz Group Title
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    When it lands, what height does it have?

    • one year ago
  2. terenzreignz Group Title
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    Wrong way to phrase it... Let me rephrase.... How high is the ball when it lands?

    • one year ago
  3. allie_bear22 Group Title
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    4.9?

    • one year ago
  4. terenzreignz Group Title
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    When it lands, is it 4.9 meters above the ground?

    • one year ago
  5. allie_bear22 Group Title
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    i have no idea

    • one year ago
  6. allie_bear22 Group Title
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    what do i have to do to get the answer?

    • one year ago
  7. terenzreignz Group Title
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    Start with that... find the height of the ball as soon as it lands. It just takes a little intuition and visualization :)

    • one year ago
  8. allie_bear22 Group Title
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    -16

    • one year ago
  9. terenzreignz Group Title
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    So... when the ball lands, it is 16 meters underground?

    • one year ago
  10. allie_bear22 Group Title
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    yupp

    • one year ago
  11. allie_bear22 Group Title
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    or no 16

    • one year ago
  12. terenzreignz Group Title
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    16 means when the ball lands, it is 16 meters above the ground (in mid-air). Does that seem reasonable?

    • one year ago
  13. allie_bear22 Group Title
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    no.

    • one year ago
  14. terenzreignz Group Title
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    Then... what is reasonable? When the ball lands, its height is...?

    • one year ago
  15. allie_bear22 Group Title
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    5f

    • one year ago
  16. terenzreignz Group Title
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    What's f?

    • one year ago
  17. allie_bear22 Group Title
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    didnt mean to put tht srry

    • one year ago
  18. terenzreignz Group Title
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    Well... you mean to tell me that when the ball *lands* it is 5 meters above the ground, then?

    • one year ago
  19. allie_bear22 Group Title
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    omg!! i really dont kno

    • one year ago
  20. terenzreignz Group Title
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    Think... meditate... :P Now... how high is the ball when it LANDS... how many meters above the ground is the ball when it LANDS...

    • one year ago
  21. allie_bear22 Group Title
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    hmmm 0?

    • one year ago
  22. terenzreignz Group Title
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    Yes. Finally :P

    • one year ago
  23. allie_bear22 Group Title
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    yay!!!! that was easy lol

    • one year ago
  24. terenzreignz Group Title
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    Of course, when the ball lands, it is on the ground. Thus, it is 0 meters above the ground.

    • one year ago
  25. terenzreignz Group Title
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    0 is not the answer. -.-

    • one year ago
  26. terenzreignz Group Title
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    that's just a stepping stone...

    • one year ago
  27. allie_bear22 Group Title
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    oh ok wat next?

    • one year ago
  28. terenzreignz Group Title
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    We need v and s. We already have v, the initial velocity, 4.9

    • one year ago
  29. terenzreignz Group Title
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    What's the initial height (s) ?

    • one year ago
  30. allie_bear22 Group Title
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    4.9^2

    • one year ago
  31. terenzreignz Group Title
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    Are you guessing? I strongly advise against it... it's too risky.

    • one year ago
  32. terenzreignz Group Title
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    And no, the initial height is not \(\ 4.9^2\)

    • one year ago
  33. allie_bear22 Group Title
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    ok thnx for your help ill do the rest by myself :) thnx

    • one year ago
  34. terenzreignz Group Title
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    Are you sure? Well, if you're sure, post your answer here.

    • one year ago
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