What is the principle of isaac newton's law of gravity?

Explanation:

According to Newton's law of gravity, two bodies in the universe attract each other with a force that is directly proportional to the product of masses and inversely proportional to the square of the distance between them. Mathematically, it is given by :

Where

m₁, m₂ are masses

d is the distance

Hence, the gravitational force is responsible for holding two objects in teh universe.

the answer is 3.1 his answer is wrong mines is right

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.