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Relativistic Momentum help

  1. May 20, 2015 #1
    1. The problem statement, all variables and given/known data
    If a mass of 1 kg has a velocity of 0.7c, what is the relativistic momentum?

    2. Relevant equations
    I dont know what equation to use....

    Please help..
  2. jcsd
  3. May 20, 2015 #2


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    Gold Member

    Start by writing down the equation for the regular, non-relativistic momentum.

    Do you know any relativistic equations for any of the values making up the momentum equation?
  4. May 21, 2015 #3
    Relativistic momentum on 4D Minkowski space have 4 coordinates.
    $$p_i=mv_i,\,p_{ct} = mc$$
    Consevation for this momentoum:
    $$ \Delta{x}^2+\Delta{y}^2+\Delta{z}^2-c^2\Delta{t}^2=\text{const}$$
    where m0 is the mass for its own frame.
  5. May 25, 2015 #4
    No, haha... I am terrible at physics...
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