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JEE Main Physics question

PhysicsGravitationJEE Main

A particle is fired vertically upwards from the surface of earth and reaches a height of 6400 km. The initial velocity of the particle is ( km, )

Answer: (B)

Solution

With , energy conservation gives $Missing argument for \dfrac\dfrac=GM(Missing argument for \dfrac\dfrac1R-Missing argument for \dfrac\dfrac1{2R})==Missing argument for \dfrac\dfrac{gR}2

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Question ID VK-154528