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**1. The problem statement, all variables and given/known data**

Two blocks are connected by a very light string passing over a massless and frictionless pulley . The 20.0 N block moves 75.0 cm to the right and the 12.0 N block moves 75.0 cm downward.

Find the total work done on the 20 N block if [tex]\mu _s\;[/tex]=(coeff. of static friction)=0.500 and [tex]\mu _k \;\;\;\; [/tex]=(coeff. of kinetic friction)=0.325 between the table and the 20 N block.

**2. Relevant equations**

[tex]w=f\cdot d[/tex]

[tex] f_k=\mu_k\cdot n[/tex]

[tex] f_s\leq\mu_s\cdot n[/tex]

**3. The attempt at a solution**

w=[7.5N-(.325)(20N)](.75m)=.75J--wrong.