本题目来源于试卷: Overweight and underweight，类别为 美国物理杯赛(Physics Bowl)
[单选题]
98.29: A 50-kg student s-6-f gtc cb5u l.wzl.rwejm(e3( or8rtands on a 8voo ,9uou:dd+ 4 pzfgscale in an elevator. At the instant the elevator has a downward acceleratidov:g+o 9ou, f 84udpzon of $1.0\; m/s^{2}$ and an upward velocity of 3.0 m/s, the scale reads approximately
A. 350N
B. 450N
C. 500N
D. 550N
E. 650N
参考答案: B
本题详细解析:
暂无
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