A certain neutron star has five times the mass of our sun packed into a sphere about 10km in radius. estimate the surface gravity on this monster. = (5)(1.99 *10^30 =m 10km =r g = G mass of earth/r^2 = 6.67* 10^ -11 9.95* 10^30/10^2 = 6.64m/s Is that the right answer? Calculate the acceleration of gravity 250km above the earth's surface in terms of g ar = v^2/r I'm really stuck I would I go about solving this problem? your help will be appreciated.