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2 dimensional projectile motion with rifle and bullet

  1. Mar 3, 2013 #1
    1. The problem statement, all variables and given/known data
    A rifle is aimed horizontally at a target 30m away. The bullet hits the target 1.9cm below the aiming point. what are the bullets time of flight and the initial velocity?


    2. Relevant equations
    ax=0
    g=9.8m/s^2
    x0=0m
    xf=30m
    y0=0m
    yf=.019m
    v0x=?
    vfx=0m/s
    v0y=0
    vfy=0
    t=?

    3. The attempt at a solution

    Here is a little picture i drew to visualize everything

    CygLmK9.png

    .019=v0y*t +1/2*g*t^2
    .019=4.9*t^2
    sqrt(.019/4.9)=t
    t=.0623s

    30m=v0x*t +1/2*ax*t62
    30m=v0x*.0623s
    v0x=481.77m/s

    Is this correct? It seems about right. I have a small time, and a high velocity. I just want to make sure that I'm right.
     
  2. jcsd
  3. Mar 3, 2013 #2

    TSny

    User Avatar
    Homework Helper
    Gold Member

    Looks good!
     
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