Question

An ideal spring with spring-constant k is hung from the ceiling and a block of mass M is attached to its lower end. The mass is released with the spring initially unstretched. Then the maximum extension in the spring is

(a)  4Mg/k

(b)  2Mg/k

(c)  Mg/k

(d)  Mg/2k

Answer 1

Correct option (b)  2 Mg/k

Explanation:

Solution: Change in gravitational energy = Energy stored in the spring