Atoms and Nuclei

A particle of mass m is moving in a circular orbit under the influence of the central force F(r)=−kr, corresponding to the potential energy V(r)=kr2∕2, where k is a positive force constant and r is the radial distance from the origin. According to the Bohr's quantization rule, the angular momentum of the particle is given by L=nh, where h=h∕(2π),h is the Planck's constant, and n a positive integer. If v and E are the speed and total energy of the particle, respectively, then which of the following expression(s) is(are) correct?