I1=m×(R+R1)2
W1=√N×M(R+R1)(R+R1)
Ek1=I1×W122 ...?
We can write W1 as (NM)^(1/2) / (R+R1)^(3/2).......so (W1)^2 = (NM) / (R+R1)^3
OK....so we have
Ek1 = [(m)(R+R1)^2] * [(NM) / (R+R1)^3 ] / 2 = [mNM]/[2(R+R1)]
