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Homework Help: Velocity of bullet fired from a gun

  1. Oct 29, 2009 #1
    1. Anyone interested in looking over the question / coments, thanks. An object mass 0.6kg is fired vertically upward in thebarrel of a gun by a vertical force of 50N acting over a period of 0.5 seconds.
    Calculate
    A. The velocity of the projectile when it leaves the barrel
    B. Height reached by object
    c. Time taken from the projectile leaving the gun to return to same height




    2. a=f/m, V=Vo + AT, V^2=U^2+2AS



    3. A. First velocity, A=F/M, 50/0.6 = 83.33m/s^2
    Velocity, V=Vo+AT, V=0+83.33 x 0.5 = 41.67ms

    B. Height: U=41.67, Vo=0, A=-G = -9.81m/s
    0=1736.4-19.62xS
    S=1736.4/19.62 = 88.5m

    C. S=(T/2)(U+V), 88.5 = T/2 (41.67+0)
    T=88.5 x 2 x 2/41.67 = 4.25 seconds
    Time to return = 2 x 4.25 = 8.5 seconds
     
  2. jcsd
  3. Oct 29, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    Re: Velocity

    Your calculations are correct.
     
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