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Homework Help: Initial Velocity

  1. Jan 26, 2010 #1
    1. The problem statement, all variables and given/known data

    Assuming the best high jump record from a standing position in a school was 1.52 m, what initial velocity was needed for this jump? neglect any sideways motion.

    2. Relevant equations

    velocity equation


    3. The attempt at a solution

    I don't really understand how to do the question? Is there a knowledge part involved that I can't figure out? There is only one given data?
     
  2. jcsd
  3. Jan 26, 2010 #2
    That is not true. Think about the situation more thoroughly. You know that his acceleration is 9.8m/s downwards. You also know that his 1.52 metres is achieved at the peak of his jump, at which time his velocity will be 0. So now you 3 pieces of information.
     
  4. Jan 26, 2010 #3
    Thanks I got the answer :D & How to do it :D
     
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