How much kinetic energy take the particles after the collision?

[skrat]

Homework Statement

What is the minimum amount of kinetic energy of proton that hits another still proton so reaction $p+p\rightarrow p+n+\pi ^+$ is possible? How big part of the initial kinetic energy is used for kinetic energy of new particles?

Homework Equations

The Attempt at a Solution

$T_{min}=292MeV$

am... I don't really understand the second question? I calculated the minimum kinetic energy with presumption that $p+n+\pi ^+$ will have no kinetic energy after the collision of protons... So... what exactly answers the second part of this problem?

 

[PAllen]

You haven't mentioned conservation of momentum.

 

[PAllen]

Also, consider the difference between how the collision looks in the COM frame vs. the lab frame. I assume the last question is being asked about the lab frame.