Three blocks A , B and C of masses 4kg ,...

Three blocks `A` , `B` and `C` of masses `4kg` , `2kg` and `1kg` respectively are in contact on a frictionless surface, as shown. If a force of `14N is applied on the `4kg` block, then the contact force between `A` and `B` is.

18 N

2 N

6 N

8 N

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