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A body has 3Kg mass 2.9Kg weight. What the value of G on this planet? Can you please give me the formula which I need to use to calculate the end result? I am studying on this for my research and it would be helpful if you can get back to me soon. Thanks!

The formula is :

g = GM/R^2


where
G = 6.67*10^-11
M = Mass of the planet (Earth in this case)
R = Radius of the planet (Radius of earth in this case)

The value of g comes out to be 9.81m/s^2.

I am surprises to see such queries here. Anyway weight is actually a force acting on a body on any heavenly body. Its formula is :-

Force = Mass x Gravity (Value of gravity of that planet).

So putting values in this formula we get

(2.9=3 x G) G is the value of gravity.
by solving it we get 0.96 m/sec.