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In a hypothetical uniform and spherical ...

In a hypothetical uniform and spherical planet of mass `M` and radius `R`, a tunel is dug radiay from its surface to its centre as shown. The minimum energy required to carry a unit mass from its centre to the surface is kmgR. Find value of `k`. Acceleration due to gravity at the surface of the planet is `g`.

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The correct Answer is:
`0.5`
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