Three particles all of mass m=3 kg are located at the vertices of an equilateral triangle and are spinning about their center of mass in an empty...

Three particles all of mass m=3 kg are located at the vertices of an equilateral triangle and are spinning about their center of mass in an empty space. The sides of the triangle are of length d=2m, which does not change with time. What is the kinetic energy of the system? ( Calculate this kinetic energy using Newton's second law equation. )