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The orbit of a planet is an ellipse, lin...

The orbit of a planet is an ellipse, line joining the planet and the sun sweeps equal areas in equal intervals of time
`F=(Gm_1m_2)/(r^2) , T^2 prop R^3`

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`F=(Gm_1m_2)/(r^2) ` is newton's law of gravitation while others are kepler's laws of planetary motion .
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