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A man of mass m starts falling towards a...

A man of mass m starts falling towards a planet of mass M and radius R. As he reaches near to the surface realizes that he will pass through a small hole in the planet. As he enters the hole he seen that the planet really made of two places a spherical shell of negligible thickness of mass `(2M)/(3)` and a point mass `(M)/(3)` of centre. Change in the force of gravity experienced by the man is

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The correct Answer is:
`2/3(GMm)/(R^(2))`
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