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Time to reach maximum height

  1. Apr 26, 2014 #1
    1. The problem statement, all variables and given/known data

    find time to reach max height
    max height is 0.870m
    mass of diver is 70kg
    makes an angle when diving of 85 degrees

    2. Relevant equations

    Vf=Vi + gt

    3. The attempt at a solution
    = 0.870/9.8

    not sure if this the right approach
  2. jcsd
  3. Apr 26, 2014 #2
    When somebody is "diving", the direction is generally downward. One cannot reach a max height moving downward. State the problem correctly and fully, it is in your interest to eliminate any guesswork for us.
  4. Apr 26, 2014 #3
    so when the person is diving from a diving board, it jumps upward before diving downwards into the water
  5. Apr 26, 2014 #4
    So in fact the question is about jumping, not diving?

    Then, when you say "makes an angle" - makes an angle WITH WHAT?
  6. Apr 26, 2014 #5
    so im assuming the height of the diver? which is 1m , theres all the information given
  7. Apr 26, 2014 #6
    OK, assuming the angle is with the vertical.

    In your attempt, why does ##v_i = 0##? Surely when somebody jumps, they have a non-zero velocity initially?
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