Neptune's gravity provides the centripetal force
the orbital altitude is not significant compared with Neptune's radius
m v^2 / r = G M m / r^2
v^2 = G M / r
... = 6.67E-11 * 1.02E26 / (2.48E7)^2
result (v) is in m/s
A satellite orbits Neptune 4000km above its surface. given the mass of Neptune is 1.02x10^26 kg and the radius of Neptune is 2.48x10^7m, Calculate the orbital speed of the satellite
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