An asteroid hits the Moon and ejects a large rock from its surface. The rock has enough

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An asteroid hits the Moon and ejects a large rock from its surface. The rock has enough speed to travel to a point between Earth and the Moon where the gravitational forces on it from Earth and the Moon are equal in magnitude and opposite in direction. At that point the rock has a very small velocity toward Earth. What is the speed of the rock when it is at an altitude of 720 km above Earth’s surface?

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