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MHT CET Physics question

PhysicsGravitationMHT CET

Distance between centres of two stars is . The masses of these stars are and and their radii are and respectively. A body is fired straight from the surface of larger star to the smaller star. What should be the minimum initial speed to reach the smaller star?

Answer: (A)

Solution

The field vanishes at from the smaller star with , so ; the body must just reach this point, where the potential is , while at the

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Question ID VK-060103