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Homework Help: Projectile Problems (very basic)

  1. May 17, 2014 #1
    A projectile is launched with 200 kg.m/s. If Jennifer weighs 583 N, what is the magnitude of her momentum?
    a) 97.0 kg.m/s
    b) 137 kg.ms
    c) 68.6 kg.m/s
    d) 672 kg.m/s
    e) 951 kg/m/s
     
  2. jcsd
  3. May 17, 2014 #2
    My attempt so I got these two formulas
    1) P = mv = 200 kg
    2) KE = 1/2 mv

    so I need mass right? so I said ok, m = P/v
    I solve for m = p/v
    m = 200 / v
    then i got stocked
    I need to find the value of "v"
    so I went to KE = 1/2 mv
    mv = KE / (1/2)
    v = (KE/1/2) / m
    v = (1000 / (1/2) ) / m
    v = 2000 / m
     
  4. May 17, 2014 #3
    I am lost
     
  5. May 17, 2014 #4

    adjacent

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    Gold Member

    Kinetic energy= ##\frac{1}{2}mv^2##
     
  6. May 19, 2014 #5
    thank you! got the answer! :)
     
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