A) 4U
B) 8U
C) 16 U
D) 2U
Correct Answer: C
Solution :
Potential energy \[U=\frac{1}{2}k{{x}^{2}}\] \\[U\propto {{x}^{2}}\][if k = constant] If elongation made 4 times then potential energy will become 16 times.
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