Space Time & Motion A.3 Work Energy and Power (id: 5c7a722d8)

本题目来源于试卷: Space Time & Motion A.3 Work Energy and Power，类别为 IB物理学

[单选题]
A varying force acts on a spring. The variation of the extension $x$ of the spring with force $F$ acting on it is shown in the graph below.


The elastic potential energy stored in the spring is $E$ when the extension of the spring is $e$. What is the work done by force on the spring to increase the extension from $e$ to $3e$?

A. $2E$
B. $4E$
C. $8E$
D. $9E$


参考答案:  C


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