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Define escape velocity. Derive an expres...

Define escape velocity. Derive an expression for the escape velocity of an object from the surface of the earth.
OR
Define escape velocity of a body at rest on the earth's surface. Obtain an expression for the same and show that it is independent of the mass of the body.
OR
Define escape velocity of the body. Obtain an expression for the escape velocity when the body is at rest on the surface of the earth and show that it is independent of the mass of the body.

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