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JEE Main Physics question

PhysicsGravitationJEE Main

A body is projected with a velocity of km/s from the surface of the earth. The velocity of the body when it escapes the gravitational pull of earth is **[Kerala CEE 2011]**

Answer: (A)

Solution

At launch, total energy (using ). At infinity this equals the final kinetic energy:

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Question ID VK-154307