where, a is acceleration of system. m=m1+m2 i.e. mass of system ∴‌‌a=‌
F
m1+m2
and since, there should be no relative motion between m1 and m2 ∴‌‌f=µN2=m2a where, f= friction force and N2= normal reaction of mass m2. ∴‌‌µm2g=m2‌