Question

Our system is a block attached to a horizontal spring on a frictionless table. The spring has a spring constant of 4.0 N/m and a rest length of 1.0 m, and the block has a mass of 0.25 kg.

Compute the PE when the spring is compressed by 0.50 m.

Answer 1

$$P_E=0.5kx^2\\P_E=0.5(4)(0.5)^2=0.5\ J\\$$