Why is the kinetic energy needed to project a body of mass m from the earth's surface to infinity mgR - Science - Gravitation

Question

Why is the kinetic energy needed to project a body of mass m from
the earth's surface to infinity mgR and not 2 mgR?

Ankur · Accepted Answer

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Why is the kinetic energy needed to project a body of mass m from the earth's surface to infinity mgR and not 2 mgR?