試題詳解

5. The figure shows three graphs of a force that acts on a block as the block slides across a frictionless floor over the indicated distance. Rank the three graphs according to the work done on the block by the force, most positive first, most negative last. () indicates a tie.

(A) 2, 3, 1
(B) (1,2), 3
(C) 2, (1,3)
(D) 3, 2, 1
(E) 1, 3, 2