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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?