The work done by the pulling force is
A = F •s •cos α = 279•9.14•cos26.3° = 2286.1 Joules.
The work done by the kinetic frictional force is
Afr = Ffr •s •cos α =kmgscos180°=
=0.259•75.9•9,8•(-1)= - 195.6.
A 279 N force is pulling an 75.9-kg refrigerator across a horizontal surface. The force acts at an angle of 26.3 ° above the surface. The coefficient of kinetic friction is 0.259, and the refrigerator moves a distance of 9.14 m. Find (a) the work done by the pulling force, and (b) the work done by the kinetic frictional force.
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