The Attempt at a Solution
The length of the rod is along
y direction and (A+B+rod) is travelling along +x direction .
Since there is no external force along x direction momentum is conserved along x direction . If v' is velocity of CM of (A+B+P) then
2mv = 3mv' gives v' = 2v/3 .
Suppose O is a point on the table just below the new CM at the moment of collision . Now , I would like to conserve angular momentum about O .
My doubt is regarding the force exerted by the rod on the balls . If the force exerted by rod is along it's length then angular momentum can be conserved .
But is it correct to assume that the rod exerts a force only along its length ? Has it anything to do with the rod being light ?
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