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coolkat4 Group Title

Micah and Delanie are in the a soapboc cart derby. Thay are about to crash into each other. They both are buckled into their respective carts and when they have their inelastic collision, they all go at a speed of 0.40 m/s in the direction frm which Micah was originally coming. If Micah's total cart mass (including himself) was 120. kg and Delanie's total cart mass (including herself) was 85.0kg, what would be the speed of each cart if the total energy "lost" in the collision was 1672.8J?

  • one year ago
  • one year ago

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  1. coolkat4 Group Title
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    @amistre64 please helpppp

    • one year ago
  2. amistre64 Group Title
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    |dw:1359734933000:dw|

    • one year ago
  3. amistre64 Group Title
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    hmm \[120v1+85v2=285(.4)+1672.8\] is what my idea is

    • one year ago
  4. amistre64 Group Title
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    of course making sure the energy lost is put in proper relation

    • one year ago
  5. coolkat4 Group Title
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    i know im pretty lost. i have to got to class. ill let you know aht the answers is and how my techer did it later. thanks for the help.

    • one year ago
  6. amistre64 Group Title
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    k, ill see what i can do on my own to see if my idea has any merit :)

    • one year ago
  7. amistre64 Group Title
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    and thats spose to be 205, not 285 ... typo :)

    • one year ago
  8. amistre64 Group Title
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    the energy in the system as it stands is: 205(.4)^2/2 = 16.4 J add that to what was lost; 1672.8 + 16.4 ------ 1689.2 kg m^2/s^2 = Mv^2/2 =102.5kg v3 m^2/s2 1689.2/102.5 = (v3)^2 sqrt(16.48) = v3 v3 is about 4.06 m/s if im thinking this correctly :)

    • one year ago
  9. amistre64 Group Title
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    this at least gives me an equation: 120 v1 + 85 v2 = 205(4.06) if i could see another way to determine a second equation in v1 and v2 we would have 2 eqs in 2 unknowns

    • one year ago
  10. amistre64 Group Title
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    im thinking that maybe: 120/2 v1^2 + 85/2 v2^2 = 1689.2 kg m^2/s^2 60 v1^2 + 42.5 v2^2 = 1689.2 but i think im just going in circles .... oh well

    • one year ago
  11. amistre64 Group Title
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    v2 = sqrt((1689.2 - 60x)/42.5) 120 v1 + 85 sqrt((1689.2 - 60x)/42.5) = 205(4.06) the calculations give me v1 as about 2.69 v2 as about 5.99 ifn i did it correctly to begin with :)

    • one year ago
  12. coolkat4 Group Title
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    yeah you did you got it right!

    • one year ago
  13. typett132 Group Title
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    help

    • 6 months ago
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