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View Poll Results: What is answer the following question?

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  • 1 Post By Rajnish Kaushik
  • 1 Post By pikpobedy

Thread: Help in speed please

  1. #1 Help in speed please 
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    hello i need help in solving this
    Q)If the speed of a vehicle increases by 2 m/s,its kinetic energy is doubled,then original speed of the vehicle is
    a)(sqrt of 2 )+1 m/s
    b)2(sqrt of 2 -1)m/s
    c)2(sqrt of 2 + 1 )m/s
    d)sqrt of 2 (sqrt of 2 + 1)m/s
    sqrt is square root of
    please help me out
    Thnx in advance
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  2. #2  
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    none of those.
    You should put a slash / in the correct place in (b)
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  3. #3  
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    Quote Originally Posted by pikpobedy View Post
    none of those.
    You should put a slash / in the correct place in (b)
    accordind to me question is right i tried and got ans as c
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  4. #4  
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    Check your answer.
    Determine the KE at your answer at c) V = 2(sqrt of 2 + 1 )m/s and the KE at 2+V = 2 + 2(sqrt of 2 + 1 ) m/s.

    Then try the KE at V = 2/((sqrt 2) -1)) and at the KE at 2+V= 2 + 2/((sqrt 2) -1))

    What do you think? smile. cute factoring in "c" 2(sqrt 2 +1) = 2/(sqrt 2 -1) which I did not immediately see. I assumed incorrect typo.
    Rajnish Kaushik likes this.
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  5. #5  
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    Quote Originally Posted by pikpobedy View Post
    Check your answer.
    Determine the KE at your answer at c) V = 2(sqrt of 2 + 1 )m/s and the KE at 2+V = 2 + 2(sqrt of 2 + 1 ) m/s.

    Then try the KE at V = 2/((sqrt 2) -1)) and at the KE at 2+V= 2 + 2/((sqrt 2) -1))

    What do you think? smile. cute factoring in "c" 2(sqrt 2 +1) = 2/(sqrt 2 -1) which I did not immediately see. I assumed incorrect typo.
    Was i right??
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  6. #6  
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    you are right
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  7. #7  
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    thnx
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