3. Which of the following is correct?
(A) Given physical quantities A and B of the same dimension (e.g. they are both thelengths of something), and quantities C and D of the same dimension, if D is uniquely determined by A, B, and C, there mustbe some num nerical constants k and n (of no dimension) such that D = kC(A/B)n.
(B) The moon is orbiting around theearth with roughly the samne period as that for its spinning around its own axis.
(C) The gravitational potential energy for Npoint masses

is the distance between particle i and particle j, and G isthe Newton constant.
(D) As the kinetic energy is given by a diffcrent formula, the total energy of an isolated system is notconserved in special relativity.
(E) The friction is a conservative force.GMMI