Q 11-05-008NEETNEET 2023Top questionEasy
The potential energy of a long spring when stretched by $2$ cm is U. If the spring is stretched by $8$ cm, potential energy stored in it will be :
Answer: (D) $16$U
Concept. $U = \dfrac12kx^2 \propto x^2$.
Step 1. Scale. $\left(\dfrac82\right)^2U = 16U$.
Answer. $16$U (Option D).
Solution by Sreeraj P, M.Sc Physics