Which scientists contributed to discovering the universal law of gravitation? check all that apply. tycho brahe albert einstein johannes kepler nicolaus copernicus sir isaac newton robert hooke

Johannes Kepler
Isaac Newton

Scientists who contributed to discovering the universal law of gravitation are Isaac Newton and Johannes Kepler. While, historically speaking, the discovery of gravitation is given to Newton, he said that he based his work on the law of motion, discovered by Kepler.  

Scientists who contributed to discovering the universal law of gravitation are isaac newton and Johannes Kepler. While, traditionally speaking, the invention of gravitation is given to Newton, the same that he based mostly his work on the law of motion, discovered by Johan Kepler.

Explanation:
Sir Isaac Newton: The Universal Law of Gravitation. there's a well-liked story that Newton was sitting underneath a fruit tree, an apple fell on his head, and he suddenly thought of the Universal Law of Gravitation

Kepler's laws explain how the planets moved around the sun but not why. Newton filled in that gap by supposing there was a force acting between the bodies that were moving around each other.

The story goes that Newton saw an apple fall to the ground and it made him wonder why the fruit always fell straight to the ground; why did it not veer off to the left or right? According to his own laws of motion, anything that begins moving from a standing start is undergoing acceleration and, where there is acceleration, there must be a force.

 The apple started in the tree and landed on the Earth, which means there must be a force of attraction between the apple and the Earth.

Ibelieve your answer is b.hope this : )

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.