Question

Calculate the work done to stretch an elastic string by 40cm if a force of 10N produces an extension of 4cm in it?

Answer 1

40 J

Step-by-step explanation:

Work = change in energy

W = 1/2 k (Δx)²

First we need to find the value of k.

F = kΔx

10 N = k (0.04 m)

k = 250 N/m

Solving for work

W = (250 N/m) (0.40 m)²

W = 40 J