A spring with spring-constant of 100 n/m is compressed 0.10 m. what is its maximum stored elastic potential energy

Elastic potential energy stored in a spring is

(1/2) · (spring constant) · (stretch or compress) ².

PE = (1/2) · (100 N/m) · (0.1 m) ²

PE = (50 N/m) · (0.01 m²)

PE = (50 · 0.01) (N · m / m²)

PE = 0.5 N · m

PE = 0.5 Joule