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Distance between the centres of two ring...

Distance between the centres of two rings is a. The masses of these rings are M and `4M`. A body of mass `m` is fired straight from the centre of the heavier ring. What should be its minimum initial speed to cross of lighter ring ? The radius of the both ring is `R`. (Assume `a gt gt R`).

Text Solution

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The correct Answer is:
`sqrt((8GM)/(R ))`
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