本题目来源于试卷: Physics Unit9: Static Equilibrium, Elasticity and Fracture，类别为 通用国际物理
[单选题]
Two telephone poles ac8qqxt.25i9 qirx46qpl* sb mre separated by 40 m and connected by a wire. A bir*a3w62,tdau7,pr m/hngt ofj ;k,q sxd of mass 0.50 kg lands on the wire midway between the poles, causing the wire to sag 2.0 m below horizontal. Assuming the wire has negligible mass, what is the * q , j3 2mk;p/toha,ftwrg s,7adun6xtension in the wire?
A. $6.2 \; N$
B. $12 \; N$
C. $25 \; N$
D. $50 \; N$
参考答案: C
本题详细解析:
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