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Homework Help: 3 ways of finding muzzle velocity?

  1. May 11, 2010 #1
    1. The problem statement, all variables and given/known data
    I have been measuring the drop over varying distances of a projectile that was fired horizontally. I have measured the drop(s) of shot from the horizontal. while recording the distances to the target.

    2. Relevant equations
    I have been told to use s=ut+1/2at^2

    3. The attempt at a solution
    accelartion=gravity
    s=1/2gt^2.
    The suggested formula uses time, and i dont have the times recorded, is there a way round or do i need time?
     
  2. jcsd
  3. May 11, 2010 #2
    The distance of the horizontal barrel from the ground is s. Knowing s you can solve for the time, t for the bullet to hit the ground. The motion of the bullet in the vertical direction is completely independent to the horizontal motion of the bullet. The vertical motion is only influenced by gravity and is similar to just dropping the bullet from the height of the barrel from the ground.
     
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