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anonymous

  • 5 years ago

can anyone help me with this question? the function d(s)=0.0056s^2 +0.14s models the stopping distance of a car, d(s), in metres, and the speed, s, in kilometres per hour. What is the speed when the stopping distance is 7m? Use a graph to solve.

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  1. amistre64
    • 5 years ago
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    plug your information into the equation (hard to graph stuff on here): 7 = .0056s^2 +.14s 0 = .0056s^2 + .14s -7 either factor or use the quadratic formula to solve.

  2. anonymous
    • 5 years ago
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    thanks, but i dont know what to factor out in the second equation, thats where i got stuck

  3. amistre64
    • 5 years ago
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    thinking.....(12% loaded).....

  4. amistre64
    • 5 years ago
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    if I did it right, and thats a BIG if... s = 28 better plug it in to double check...

  5. anonymous
    • 5 years ago
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    alright, checking

  6. amistre64
    • 5 years ago
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    ack!! not correct....

  7. anonymous
    • 5 years ago
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    how did u get it? im so lost :p

  8. amistre64
    • 5 years ago
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    lol .... I just plugged it into the quadratic formula but made a mistake somewhere... gonna try it again :)

  9. anonymous
    • 5 years ago
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    sounds good : )

  10. amistre64
    • 5 years ago
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    lets try 25 :)

  11. amistre64
    • 5 years ago
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    25 works good :)

  12. anonymous
    • 5 years ago
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    alright, thank you (:

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spraguer (Moderator)
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