Question

The system is released from rest with spring initially in its natural length. If mass of the block m = 10 kg, and spring constant k = 100 N/m, then maximum extension in spring is : 

(A) 1m

(B) 1/2 m

(C) 2 m

(D) 2.5 m 

Answer 1

Correct option (A) 1m

Explanation: 

Let maximum elongation in spring be X, then block descends through x/2