Question

Elastic Potential Energy
𝑃𝐸௘௟௔௦௧௜௖ = 𝑘𝑥ଶ
2
PEelastic= elastic potential energy
k = spring constant (N/m)
x = distance stretched or compressed (m)
5. A spring with spring constant 40 N/m is extended 2 m. What is the elastic potential energy
stored?

Answer 1

Elastic potential energy: PE = 1/2 k x^2.

Here k = 40 N/m, x = 2 m:

PE = 1/2 × 40 × (2)^2 = 0.5 × 40 × 4 = 80 J.

So the energy stored is 80 joules.