Finding electron speed from E2 = c2p2 + m2c4

[Physics Student 1234]

Homework Statement

Homework Equations

E = γmc²
p = γmv
K = E - mc²
E² = c²p² + m²c⁴

The Attempt at a Solution

I have completed most of this question, but I am struggling to get the required result to the final part of the question.[/B]

 

[Orodruin]

Please note that forum guidelines require you to show your attempted solution. Without it, how are we supposed to see where you have gone wrong?

Also, please include (and preferably type out) the entire question. It seems to me that what you have given is a part of a larger question. Taken out of context, the question makes no sense since the energy divided by c is only the momentum for a massless particle, which the electron is not.

 

[Physics Student 1234]

Please note that forum guidelines require you to show your attempted solution. Without it, how are we supposed to see where you have gone wrong?

Also, please include (and preferably type out) the entire question. It seems to me that what you have given is a part of a larger question. Taken out of context, the question makes no sense since the energy divided by c is only the momentum for a massless particle, which the electron is not.

I've posted the rest of the question. My attempts at this part of the question are lots of messy algebraic manipulations. I'd just like to know the correct way to approach the problem.

 

[Orodruin]

The forum rules require you to provide your attempt. It is not optional Nobody here is going to reply unless you do since that would also break forum rules.