c. Write the three laws given by Kepler. How did they help Newton to arrive at the inverse square law of gravity?
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1 Answer
Kepler's first law:
The orbit of a planet is an ellipse with the Sun at one of the foci.
Kepler's Second law:
The line joining the planet and the Sun sweeps equal areas in equal intervals of time
Kepler's Third law :
The square of its period of revolution around the Sun is directly proportional to the cube of the mean distance of a planet from the Sun.