Planet Zero has a mass of 5.0 × 10^23 kg and a radius of 2.0 × 10^6 m. A space probe is launched vertically from the surface of Zero with an initial speed of 4.0 km/s. What is the speed of the probe when it is 3.0 × 10^6 m from Zero's center?
a. 3.0 km/s
b. 2.2 km/s
c. 1.6 km/s
d. 3.7 km/s
e. 5.9 km/s
b
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