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Unformatted text preview: at the planet’s surface. • m is the mass of the object. • M planet is the mass of the planet. • R planet is the radius of the planet. 3. Gravitational force of a planet on an object at the planet’s surface. F g = m g planet example: g Earth = 10 m/s 2 1 4. Escape velocity from an object (such as a planet or star): v escape = v u u t 2 GM object R object 2...
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