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Kinematics help - object is dropped from a height h

  1. Mar 5, 2014 #1
    Kinematics help -- object is dropped from a height h

    1. The problem statement, all variables and given/known data
    An object is dropped from a height h and strikes the ground with a velocity v. If the object is dropped from a height of 2h, which of the following represents its velocity when it strikes the ground?

    A) v

    B) 1.4v

    C) 2v

    D)4v

    2. Relevant equations

    Not sure.



    3. The attempt at a solution

    I thought that velocity in this situation would be represented as 2v, but the answer in my book says the correct answer is B. I wasn't quite sure how to figure that out or what the relevant equation for figuring this problem out might be.
     
  2. jcsd
  3. Mar 5, 2014 #2
    Try this equation:
    $$v^{2} = v_{0}^{2} - 2g\Delta y$$
     
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