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Two identical balls A and B each of mass...

Two identical balls A and B each of mass 2kg and radius R, are suspended vertically from an inextensible strings as shown in fig. Third ball C of mass 1 kg and radius `r = (sqrt(2) - 1)R` falls and hits A and B symmetrically with 10m/s. Speed of both A and B just after the collision is 3m//s.
Impulse provided by each string during collision is

A

`6sqrt(2)Ns`

B

12 Ns

C

`3sqrt(2) Ns`

D

6 Ns

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The correct Answer is:
D
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