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Q.

Ball A of mass m after sliding from an inclined plane strikes elastically with another ball B of mass 3m at rest. The minimum height h, so that the ball B just completes the circular portion of the surface at C, will be nR then value of n (all surfaces are smooth)

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answer is 10.

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Detailed Solution

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uA=2gh, vB=2m1uAm1+m2=uA2=2gh2 To complete vertical circle,  vB2=5gR ⇒2gh4=5gR∴h=10R

 

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