A block the of mass 4kg is placed on ano...

A block the of mass `4kg` is placed on another block of mass `5kg` and the block `B` rests on a smooth horizontal table for sliding the block `A` on `B` a horizontal force `12N` is required to be applied force on it How much maximum horizontal force can be applied on 'B' s that both `A` and `B` move together? Also find out the accleration proudced by this force
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