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