Question on energy conservation with centripetal acceleratio

  • #1
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Homework Statement


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.

Homework Equations


conservation of mechanical energy??

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?

Thanks!
 

Answers and Replies

  • #2
410
11
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
 
  • #3
haruspex
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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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