本题目来源于试卷: Parameters and Typical Relationship，类别为 美国物理杯赛(Physics Bowl)
[单选题]
12.17: A mass moves according to the graph of position as ,:-+ fk1x 2bajv eqx)bgv1 hkk a function of time sho b h+k1f:aq,jk2ge1-b) xk vxv hfjnd .6a4+vgwn + dnahgj64. fv below.
Which one of the following choices correctly represents the time instants or time interval for which the instantaneous velocity of the mass is considered always to be negative? Lettrepresent time.
A. $t = 0.0 s, t = 5.0 s, and t = 10.0 s$
B. $0.0 s < t < 2.5 s$
C. $ 2.5 s < t < 7.5 s$
D. $5.0 s < t < 10.0 s$
E. $2.5 s < t < 10.0 s$
参考答案: C
本题详细解析:
暂无
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