[单选题]
You lift a 10-N physwg(sbve6 0vrvpzj:;);mc a3qs axj5am8e4- t ics bookmctgr8 rtv(sjhs arr;/l3 +-;q-6xvu up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. Wha -tm 6q3;vhx(tr+gc/u-ar 8rvj ;ss rlt is the work done by the weight of the book?
