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Physics
Physics
Problem
Which of the following expressions gives the elastic potential energy U stored in an ideal spring when it is displaced by a distance x from its equilibrium position? a)
−
1
2
k
x
2
-\dfrac{1}{2} k x^{2}
−
2
1
k
x
2
b)
1
2
k
x
2
\dfrac{1}{2} k x^{2}
2
1
k
x
2
c)
k
x
2
k x^{2}
k
x
2
d)
1
3
k
x
2
\dfrac{1}{3} k x^{2}
3
1
k
x
2
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