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The small spherical planet called "Glob" has a mass of 6.50×1018kg and a radius of 6.20×104m. An astronaut on the surface of Glob throws a rock straight up. The rock reaches a maximum height of 1.40×103m above the surface of the planet before it falls back down. What was the initial speed of the rock as it left the astronaut's hand? (Glob has no atmosphere, so no energy is lost to air friction.) 6.67E-11Nm2/kg2.

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