physics
posted by george .
block A (mass 2.04kg) rests on a tabletop. It is connected by a horizontal cord passing over a light, frictionless pulley to a hanging block B (mass 3.00kg ). The coefficient of kinetic friction between block A and the tabletop is 0.215.
After the blocks are released from rest, find the speed of each block after moving 4.00cm .

m2•a=m2•gT
m1•g=TF(fr)
a• (m1+m2) = m2•gF(fr)=m2•gμ•m1•g
a=g• (m2μ•m1)/(m1+m2)
v=sqrt(2•a•s)