What work needs to be done to stretch the 40 kN / m spring by 0.5 cm?

We will not be able to find a job right away, we need to perform several transformations. From the formula: F = kx, we find the force that needs to be applied to stretch the spring. Let’s translate the meters into the SI system: 0.5 cm – 0.005 m. Substitute and count. F = 40 * 10 ^ 3 * 0.005 = 200 (H). Now we write down the formula for determining the work and substitute the obtained values: A = F * S = 200 * 0.005 = 1 (J).