# Calculus

The gravitational force, F, on a rocket at a distance, r, from the center of the earth is given by F=k/r^2
where k = 10^13 newton • km2. When the rocket is 10^4 km from the center of the earth, it is moving away at 0.2 km/sec. How fast is the gravitational force changing at that moment? Give units. (A newton is a unit of force.)

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