試題詳解

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