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The Acceleration Of Free Fall?

  1. Sep 25, 2004 #1
    ''A DART LEAVES THE THROWER HAND HORIZONTALLY AT A height of 1.9m above the ground, calculate the time taken by the dart to reach the board and the horizontal velocity at which the dart left the throwers hand.''
    this is what iv worked out
    x-0.4
    u-?
    v-0
    a-0
    t-?
    i than went onto finding the verticle acceleration
    x-0.4, u-?, v-0. a-9.81, t-?
    v^2=u^2+2ax
    v^2-u^2=2ax
    v^2-v^2-u^2=2ax-v^2
    u^2=2ax-v^2
    -u^2=2ax-v^2
    2x9.81x0.4=7.84
    i than found the square root of 7.84 however it was wrong, since it was -u^2
     
  2. jcsd
  3. Sep 25, 2004 #2
    we are talking on earth here? if so, what acceleration do we all experience on earth...the acceleration due to __________
     
  4. Sep 25, 2004 #3
    Gravity! :)
     
  5. Sep 26, 2004 #4
    ................ ;-)
     
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