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Question

What is the magnitude of the gravitational force between the earth and 1kg object on its surface

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Solution

Mass of the body, m= 1 kg
Mass of the Earth, M= 6 x 10^24 kg
Radius of the earth, R= 6.4 x 10^6 m
Now magnitude of the gravitational force (F) between the earth and the body can be given as

F = GMm/R^2.

Putting values we get, F = 9.8 N

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