Two block A and B are arrenged as shown in figure `(m_(A) = 5 kg and m_(B) = 10 kg)` Find the acceleration of blocks if `F = 40 N`

Explanation

First of all find value of limiting friction at all contact surface `(f_(s max))` maximum force upper surface of `10 kg` can experience is `25 N` is it will not more relative to ground

Hence only `5 kg` will move ,
`a_(A) = (40 - 25)/(5) = 3 ms^(-2)`
and `a_(B) = 0`