Question

Prove that it the earth attracts two bodies placed at the same distance on centre of the eath with equal forcethen their massses will be the same and mathematically express the acceleration due to gravity in terms of mass of the earth and radius of the eath and why g is called a universeal constant

Answer 1

g is the local acceleration due to gravity between 2 objects. ... 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.

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