Question

A spring with a spring constant of 4 N/m is stretched by Sarah's dog until extended by 2 m. How much elastic potential energy is stored by the spring?

Answer 1

Hi there!

Recall the equation for spring potential energy:

`PE = (1)/(2)kx^2`

k = Spring constant (N/m)

x = extension of spring from equilibrium (m)

PE = Potential Energy (J)

Plug in the given values:

`PE = (1)/(2)(4)(2^2) = \boxed{8 J}`