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A spherical uniform planet is rotating a...

A spherical uniform planet is rotating about its axis. The velocity of a point on its equator is `7.5 kms^(-1)`. Due to the rotation of the planet about its axis, the acceleration due to gravity g at equator is `1//2` of g at poles. What is the escape velocity `("in km s"^(-1))` of a particle on the planet from the pole of the planet?

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