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Homework Help: Question on energy conservation with centripetal acceleratio

  1. Apr 28, 2016 #1
    1. The problem statement, all variables and given/known data
    Untitled 2.jpg Untitled 3.jpg

    The right answer is E, and I have no idea how to solve this problem.

    Please advise on how to proceed. Thanks in advance.
    2. Relevant equations
    conservation of mechanical energy??

    3. The attempt at a solution
    Many attempts were done, but I am lacking on theory with this. How and why should I choose E and eliminate the other answers?

  2. jcsd
  3. Apr 28, 2016 #2
    UPDATE: I was able to figure out why I and II are wrong, but I am now stuck on roman numeral III.

    Thanks in advance for the help
  4. Apr 28, 2016 #3


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    Consider the speed, v, at point B. How does this relate to H? How does it relate to the centripetal force at B?
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