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anonymous

  • one year ago

Okay, I have no clue what I am doing wrong. I've been following part a of this http://www.webassign.net/latex2pdf/2a2176c1f300dcc09b8a130c84af8595.pdf solution to help me with part a of this question I'm stuck on: If a rock is thrown upward on the planet Mars with a velocity of 18 m/s, its height (in meters) after t seconds is given by H = 18t − 1.86t^2. Find the velocity of the rock after two seconds. No matter what I do, it's still the wrong answer and it's becoming really frustrating considering that notes that my professor gave my class doesn't help with this at all.

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  1. Plasmataco
    • one year ago
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    ...

  2. Plasmataco
    • one year ago
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    im sry. only 13. I can try u know, being asian and all but no garentees.

  3. Plasmataco
    • one year ago
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    maybe just sub in 2 for t

  4. Plasmataco
    • one year ago
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    did u include direction? velocity is direction and speed.

  5. Plasmataco
    • one year ago
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    28.56 m/s upward?

  6. anonymous
    • one year ago
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    There's no direction at all. it has to be found the same way as the answer was found is the solution pdf I posted. This question has to be found the same was as that of solution a.

  7. Plasmataco
    • one year ago
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    .

  8. Plasmataco
    • one year ago
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    perhaps set ur limit to 2?

  9. Plasmataco
    • one year ago
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    I think u need to use derivative.

  10. Plasmataco
    • one year ago
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    try 10.56. if correct, i'll tell u why.

  11. Plasmataco
    • one year ago
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    hello?

  12. anonymous
    • one year ago
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    you have to find v(2)

  13. Plasmataco
    • one year ago
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    did she just leave?

  14. Plasmataco
    • one year ago
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    i think she just ditched which means eiither I got it right... or I MESSED UP AND SHE MAD.

  15. anonymous
    • one year ago
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    I left because you weren't helping me at all with what you were suggesting and was adding to my frustration. And surjithayer, I knew I had to find v(2), that's the whole point of the question but I was struggling with trying to get the correct answer.

  16. anonymous
    • one year ago
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    \[\frac{ dH }{ dt }=18-2*1.8t=18-3.6t\] when t=2 v=18-3.6*2=18-7.2=10.8 m/s

  17. anonymous
    • one year ago
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    it is not 1.8 ,it is 1.86 2*1.86=3.72 when t=2 v=18-3.72*2=18-7.44=10.56m/s

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spraguer (Moderator)
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