A block of mass 10 kg is attached to a spring ( K = 100 N/m) in four configurations P, Q, R and S shown in the figure. The block is released when the spring is relaxed. Match the maximum elongation of

Question

A block of mass 10 kg is attached to a spring ( $K = 100$ N/m) in four configurations P, Q, R and S shown in the figure. The block is released when the spring is relaxed. Match the maximum elongation of the spring in List-I with List-II and choose the correct option. (Take $g = 10$ m/ $s^{2}$ )

List-I	List-II
(P) Configuration P	(1) 1 m
(Q) Configuration Q	(2) 2 m
(R) Configuration R	(3) 3 m
(S) Configuration S	(4) 4 m
-	(5) None of these

TestHub · Accepted Answer

At maximum elongation x the block is momentarily at rest, so loss in gravitational PE equals spring PE. Applying energy balance to each configuration ( m g = 100 N): P: x = 2 m g / K = 2 m, so P → 2 . Q: x = 4 m g / K = 4 m, so Q → 4 . R: x = m g / K = 1 m, so R → 1 . S: x = 2 m g / K = 2 m, so S → 2 . Answer (A).

Physics - W.E.P. Question with Solution | TestHub

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JEE Main 2027 (Class 12+)