A scientific landing probe of mass 620 kg is launched from the surface of Triton (a moon of Neptune) to a parking orbit at an altitude of 1200 km above Triton's surface. Triton has a mass of 2.14 × 1022 kg and a mean radius of 1350 km.
What is the change in the gravitational potential energy of the probe? (Take G=6.67×10−11 N m2 kg−2G = 6.67 \times 10^{-11}\text{ N m}^2\text{ kg}^{-2}G=6.67×10−11 N m2 kg−2)
3.1×108 J3.1 \times 10^8\text{ J}3.1×108 J
3.5×108 J3.5 \times 10^8\text{ J}3.5×108 J
5.8×108 J5.8 \times 10^8\text{ J}5.8×108 J
6.6×108 J6.6 \times 10^8\text{ J}6.6×108 J
