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Torque Due to Gravity

what does it ...

Question

what does it mean? - the entire mass of any object is at the center of the earth

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Solution

I think this sentence belongs to the defanition of centre of gravity.

It says that the point where entire mass of body is supposed to be concentrated, is called centre of gravity.

The sentence you have provided doesn't sound familiar, unless it's the defanition of centre of mass or gravity.

Hope this helps.
Good luck.

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