1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
    Vi=0
    Vf=gt
    t=vf/g
    = 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?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted