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In general the formula was developed by Isaac newton and is F=G([m1*m2]/D^2)

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F is the force of gravity being calculated in Newtons

G is the Gravitational Constant of 6.673E-11 Newtons.

The Ms are the masses of the objects in question.

D is the distance between the centers of the objects.

If what you want is a formula for acceleration due to gravity on Terra, it would be 9.8m/s/s (9.8 meters per second per second). Exempli gratia, if an object falls for one second it will travel at 9.8, if it falls for two it will be at 19.6, for three a speed of 29.4.

These are the two "formulas for gravity," have fun with physics.

To find gravity of earth...

Let M= mass of earth

m= mass of an object on earth.

R= radius of earth.

You may know F=mg, g being the gravity of earth.

Also, the force exerted on the body by earth, F=GMm/R(square)

So, g= F/m which is GM/R(square) which is a constant = 9.8m/s(square)

It means a body will gain a velocity of 9.8m/s each second during its free fall, neglecting other forces like air resistance acting on it.

You might wonder why rain drops coming from such height do not gain much speed. Its because it attains a constant terminal velocity due to air resistance. Just imagine if this might not have been the case!

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