a)Vectorial:F+Ff+N+G=0
Scalar:Ox:F-Ff-mgsinα=0
Oy:N-mgcosα=0=>N=mgcosα
Ff=μN=μmgcosα
sin²α+cos²α=1<=>0,36+cos²α=1=>cos²α=64=>cosα=0,8
F-μmgcosα-mgsinα=0<=>15,2-16μ-12<=>16μ=3,2=>μ=0,2
b) Vectorial:F'+N+G+Ff=ma
Scalar:Ox:F'+mgsinα-Ff=ma
Oy:N-mgcosα=0=>N=mgcosα
a=(F'+mgsinα-Ff)/m=(8+12-3,2)/2=8,4 m/s²
c)v=vo+at=0+8,4*2=16,8 m/s