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Vertical motion problem

  1. Jan 14, 2015 #1
    • Missing homework template due to originally being posted in other forum.
    (Neglect air resistance in all cases)
    An object falls down from the top of a high overhanging cliff. How far does it fall in the third second of its motion?

    I don't know which formula to use. I know that a=9.8ms^-2 and t=3s I think.
    Apparently the answer is 24.5m. But I don't know how to work it out. :C
  2. jcsd
  3. Jan 14, 2015 #2


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    When does the third second of the fall begin? tinitial = ?
    When does the third second end? tfinal = ?
  4. Jan 14, 2015 #3


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    Hi jefflee0510 and welcome to Physics Forums!

    Please post your homework and homework-like questions in the homework forums. You are also required to show some effort when posting in these forums. Simply saying "I have no idea where to begin is not good enough". See our homework guidelines.
  5. Jan 14, 2015 #4


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    Hi Jef, welcome to the homework part of PF :)

    The idea here is that you use the homework template
    1. The problem statement, all variables and given/known data
    2. Relevant equations
    3. The attempt at a solution​
    And the helpers are are obliged to protest if parts are missing. That explains the reception you got from Oro.

    As to your statement: I don't know.. -- That can be solved if you pick something that you think is reasonable (e.g. from here) and start to work on the solution by filling in things from 1.) in the template.

    In the mean time, Bystander has already helped you on you way !
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