33. A child uses a horizontal rope to pull a toy box weighing 100 N on a table. Given that the coefficient of kinetic friction between the box and the table is 0.05, what is the work done by the child to move the box 50 cm at a constant speed? (A) 0.25 J (B) 0.50 J (C) 2.5 J (D) 5.0 J (E) 10 J