本题目来源于试卷: Physics Unit6: Work and Energy，类别为 通用国际物理
[单选题]
You throw a ball straight up. djqdyn0k9v u5zb5log*j 77g; r:7hr q oq-sj yz9*r0hCompare the sign of the work done by gravity while the ball goes up with the sign of the work done by grasy z*0qh9 rj-ovity while it goes down.
A. Work is + on the way up and + on the way down.
B. Work is + on the way up and - on the way down.
C. Work is - on the way up and + on the way down.
D. Work is - on the way up and - on the way down.
参考答案: C
本题详细解析:
暂无
| 
