Question: An asteroid hits the Moon and ejects a large rock from its surface. The rock has enough speed to travel to a point between the

An asteroid hits the Moon and ejects a large rock from its surface. The rock has enough speed to travel to a point between the Earth and the Moon where the gravitational forces on it from the 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 encounters Earth's atmosphere at an altitude of 700 km above the surface?

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