Two masses m1 and m2 are moving with velocities v1 and v2 respectively. Find their total kinetic energy in the reference frame of centre of mass.
A. m1m2/m1+m2(v1−v2)²
B. 1m1m2/2m1+m2(v1−v2)²
C. 1m1m2/2m1+m2(v1+v2)²
D. 1/2(m1m2)(v1−v2)²