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## Homework Statement

A proton strikes a stationary alpha particle (4He nucleus) head-on. Assuming the collision is completely elastic, what fraction of the proton’s kinetic energy is transferred to the alpha particle?

## Homework Equations

Pi = Pf

Ki = Kf

## The Attempt at a Solution

Tried finding the speed with:

mv^2 = m1v1^2 + 4 x m2v2^2

m is cancelled out

So,

v^2 = v1^2 + 4 x v2^2

Kinda stuck from this point on! I have no idea what to do.

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