Neutron stars are created when giant stars die in supernovas and their remaining cores

collapse to a state of immense density where protons and electrons combine to form

neutrons. A neutron star is ~1.4 times as massive as the sun and has radius of only

~10 km. For this neutron star compute its escape velocity. What percentage of the

speed of light does this correspond to? (Assume for the mass of the sun, M = 1.989 x 10^30 kg).