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allie_bear22

  • one year ago

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?

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  1. terenzreignz
    • one year ago
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    When it lands, what height does it have?

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

  3. allie_bear22
    • one year ago
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    4.9?

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

  5. allie_bear22
    • one year ago
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    i have no idea

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

  7. terenzreignz
    • one year ago
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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 :)

  8. allie_bear22
    • one year ago
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    -16

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

  10. allie_bear22
    • one year ago
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    yupp

  11. allie_bear22
    • one year ago
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    or no 16

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

  13. allie_bear22
    • one year ago
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    no.

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

  15. allie_bear22
    • one year ago
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    5f

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

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

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

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

  20. terenzreignz
    • one year ago
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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...

  21. allie_bear22
    • one year ago
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    hmmm 0?

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

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

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

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

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

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

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

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

  30. allie_bear22
    • one year ago
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    4.9^2

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

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

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

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

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