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IT IS FROM PRACTICE BOOK OF OLYMPIAD.MY TEACHERS TOLD BUT IT WAS SOME 4 INCH TWO EQUATION AND TOLD ME TO SOLVE.

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closed as off-topic by Hritik Narayan, John Rennie, Steeven, David Hammen, Kyle Kanos May 27 '17 at 11:13

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Forget about the asteroid with an empty cavity. What we have here is two spherical asteroids, one inside the other, and the smaller one with negative mass.

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  • $\begingroup$ negative mass in classical mechanics $\endgroup$ – Aryan May 27 '17 at 10:19
  • $\begingroup$ Please don't answer homework questions, as they are explicitly off topic and answering them indicates that they are on topic. $\endgroup$ – Kyle Kanos May 27 '17 at 11:14
  • $\begingroup$ @Aryan Negative mass here is a mathematical trick that results in the same results.. (It doesn't have to exist.) $\endgroup$ – Hritik Narayan May 27 '17 at 12:54

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