Mars has a mass of 6.4 × 1023 kg and a radius of 3400 km. A probe of mass 450 kg is lifted from Mars's surface to an orbit 800 km above its surface. 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)
1.3×109 J1.3 \times 10^9\text{ J}1.3×109 J
1.1×109 J1.1 \times 10^9\text{ J}1.1×109 J
4.6×109 J4.6 \times 10^9\text{ J}4.6×109 J
1.8×1010 J1.8 \times 10^{10}\text{ J}1.8×1010 J
