Final answer:
The work of friction does not depend on the body's initial speed when sliding down an inclined plane.
Step-by-step explanation:
When a body slides down an inclined plane, the work of friction does not depend on the body’s initial speed. The work of friction is determined by two factors: the coefficient of friction between the surfaces in contact and the normal force acting perpendicular to the surface. The initial speed of the body does not directly affect these factors, so the work of friction remains constant.