Definition of relative energy lost

AnkhUNC

1. The problem statement, all variables and given/known data
I need to relate the definition of relative energy lost to V. I am given δ = 4ρ/(1 + ρ)^2 when θt = 0° .... so this is when the two particles would stay connected?

Where p = m/M <1

and:

m/M = (sin^2(θt – θp) – sin^2θt)/sin^2θp
M/m = (1 + V^2 – 2Vcosθp)/(1 – V^2) where V = vp/v0

But I have absolutely no idea how to relate them :(


2. Relevant equations



3. The attempt at a solution