本题目来源于试卷: Work Energy and Power，类别为 美国物理杯赛(Physics Bowl)
[单选题]
17.11: A 5.00 kg block slides rb3 p,e,/.qo+x 1ht xat3n; zx,lrjfa with uniform acceleration on a horizontal *+rwcg/wr0x jy3x0 o1exdq w)surface for 5.00 s. The block’s kinetic energy strictly decreasesdr3rw *+g/ 0e0y jw1qcw )oxxx from 50.0 J to 20.0 J in this time.
What is the average speed of the block during the motion described?
A. 7.00 m/s
B. 3.74 m/s
C. 3.65 m/s
D. 2.65 m/s
E. 2.58m/s
参考答案: C
本题详细解析:
暂无
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