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Per NCERT §5.9 (Summary 6), the elastic potential energy stored in a spring extended by x is which?
A(1/2) k x
Bk x
Ck x²
D(1/2) k x²
Answer & Solution
Correct answer: D. (1/2) k x²
NCERT Summary 6: V_spring = (1/2) k x². Zero at equilibrium x = 0.
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