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Homework Help: Wrong relationship?

  1. Mar 5, 2012 #1
    Hi, i was doing practice questions for an exam in a couple of weeks and i had his question:
    An object is dropped from height hand strikes the ground at time t, if the object is dropped from a height of 2h, which of the following represents the time it will take to strike the ground?
    A. t
    B. 1.4 t
    C. 2t
    D. 4t
    I created the following relationship to answer the question: vtsinø=h, thus it is a direct relationship so i chose answer C. Turns that my answer was incorrect, can anyone tell me what did i do wrong??
  2. jcsd
  3. Mar 5, 2012 #2
    Ah, now i know what i did wrong. the relationship i formulated did not factor in acceleration of the object and therefore is inadequate to account for all the variable affecting time. the correct relationship is x=1/2at(sq)
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