Three identical blocks, each having a mass `M`, are pushed by a force `F` on a frictionless table as shown in (figure) What is the acceleration of the blocks? What is net force on block `A`? What force does `A` apply on `B`? What force does `B` apply on `C`? show action reaction pairs on the contact surface of the blocks.

Explanation

`F - T_(2) = ma` …..(i)
`T_(2) - T_(1) = ma` …….(ii)
`T_(1) = ma` ……(iii)
By adding equation (i), (ii) and (iii)
`F = 3m a a = (F)/(3m)` From equation (iii) `T_(1) = m ((F)/(3m)) = (F)/(3)`
And from equation (ii) `T_(2) = T_(1) + ma` `= (F)/(3) + m ((F)/(3m)) = 2F//3`