本题目来源于试卷: Physics Bowl by Topic 2: Kinematics - part I General Motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
05.34: A 40-kg boy is stagoc/ooe1un.a +2 )xk5qrf1ljlo 2 0rn tionary on a 30-svx -3boa9f4fkg plank that is sliding at 5.00 m/s to the right across a frictionless pond. The boy then turns and starts walking on the plank at a rate of 4.00 m/s to the left, relative to the plank. What is the speed of the plank relative 4-xb3ofs9 a vfto the pond now?
A. 1.00 m/s
B. 6.08 m/s
C. 7.29 m/s
D. 9.00 m/s
E. 17.00 m/s
参考答案: C
本题详细解析:
暂无
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