Question

Write the three laws given by Kepler's how did they helps Newton to arrive at the Inverse Square Law of Gravity?

Answer 1

In a sense, Kepler’s laws gave Newton a goal to reach: whatever law he proposed for gravity, it had to be such as to yield Kepler’s laws as a consequence. If it did not, it had to be wrong. Newton was able to show that the form he arrived at, the inverse square dependence, was just what was needed to get Kepler’s laws.