Vectorial: F+G+N+Ff=ma
Ox:F-Ff=ma
Oy:N-mg=0=>N=mg
Ff=μN=μmg
F-μmg=ma<=>16-0,2•10•6=6a<=>16-12=6a<=>6a=4=>a=0,66 m/s^2
Vectorial:G'+N'+F+Ff=0
Ox:F-Ff=0=>F=Ff=16 N
Oy:N'-m'g=0=>N'=m'g
Ff=μN'=>N'=Ff/μ=16/0,2=80 N
N'=m'g=>m'=N'/g=80/10=8 kg
m'=m+m1=>m1=m'-m=8-6=2 kg