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burhan101

  • 2 years ago

Velocity = 9t²-81t+162 At what time,t, is the velocity not changing?

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  1. ganeshie8
    • 2 years ago
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    find its vertex

  2. julian25
    • 2 years ago
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    but really the velocity is not changing there?

  3. ganeshie8
    • 2 years ago
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    |dw:1371752495017:dw|

  4. burhan101
    • 2 years ago
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    0= 9t²-81t+162 ? @ganeshie8

  5. julian25
    • 2 years ago
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    yes the rate of change there is 0

  6. ganeshie8
    • 2 years ago
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    @burhan101 look up formula for "vertex of parabola"

  7. ganeshie8
    • 2 years ago
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    vertex occurs at \(\frac{-b}{2a}\)

  8. ganeshie8
    • 2 years ago
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    a = 9 b = -81 just plugin

  9. burhan101
    • 2 years ago
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    x=9/2

  10. ganeshie8
    • 2 years ago
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    correct ! thats the time when verlocity becomes 0

  11. ganeshie8
    • 2 years ago
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    *velocity

  12. burhan101
    • 2 years ago
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    4.5

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