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MHT CET 2023 Physics question

PhysicsGravitationMHT CET 2023

A body (mass m) starts its motion from rest from a point distant () from the center of the earth. The velocity acquired by the body when it reaches the surface of earth will be (G = universal constant of gravitation, M = mass of earth, R = radius of earth)

Answer: (B)

Solution

Apply conservation of mechanical energy between the starting point (at rest, distance ) and the surface (distance R): . So , giving $ = 2GM( -

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Question ID VK-098107