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Relativistic Momentum problem

  • Thread starter kikko
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  • #1
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Homework Statement



Mass of particle = 5GeV/C^2
Momentum of particle = 5GeV/c

Find total energy of particle and speed of particle.

Homework Equations



E=λmc^2
p=λmu
λ=(√(1-(u/c)^2))^-1

The Attempt at a Solution



When I try so solve for speed, I realize λ is a function of u, so get this:

(u*(√(1-(u/c)^2))^-1) = p/m = c, but can't solve for u from that.

How would I go about approaching this problem?
 

Answers and Replies

  • #2
vela
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Try finding another relationship between E, p, and m in your textbook.

You can solve for u in your approach, but your assertion that p/m=c isn't correct.
 

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