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Questions  

A long spring is stretched by 2 cm. Its potential energy is U. If the spring is stretched by 10 cm, its
potential energy would be 

a
U25
b
U5
c
U
d
25 U

detailed solution

Correct option is D

Potential energy of the spring,  U=12kx2 or U∝x2Stretch is increased by 5 times. Therefore, stored potential energy will be increased by 25 times.

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Similar Questions

Two similar springs P and Q have spring constants Kp and KQ such that Kp > KQ. They are stretched first by the same amount (case a), then by the same force (case b). The work done by the springs WP and WQ are related as, in case (a) and case (b), respectively.


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