Ball A is attached to ball B which is again attached to ball C, all are initially arranged in the same horizontal line i.e the string is initially horizontally, connected, ball B lies at the centre between ball A and C, if the Ball B is pulled upward with a velocity of 3ms-1, and the masses of each ball is 3m then find the tension in the string between A and B and between B and C when A and C collide

Dear student
According to your question collision will take place than the string will become vertical at the time of collision .Than the 
force acting on any ball A or C is in the vertical direction in the form of tension of the thread and the gravitational force .
So acceleration along the surface at the time of collision is zero.So tension in the thread cannot be defined athis position from the given osition.

Regards

 

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