Question

explain universal law of gravitation
acceleration due to gravity

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Answer 1

Answer:

the universal law of gravitation states that the gravity attracts or repels things. every object that has mass will have gravity.

the acceleration due to gravity, means, the speed and velocity increased or enduced on the body during a free fall

Answer 2

The 9.8 m/s^2 is the acceleration of an object due to gravity at sea level on earth. You get this value from the Law of Universal Gravitation. Force = m*a = G(M*m)/r^2. Here you use the radius of the earth for r, the distance to sea level from the center of the earth, and M is the mass of the earth.