A spring required a force of 5.0 n to compress it 0.1 m. How much work is required to stretch the spring 0.4 m?

= 4 joules

Explanation:

Work done by a spring is given by the formula;

Work done = ke²

Where, k is the spring constant

e is the extension.

But;

k = F/e

= 5 N/0.1 m

= 50 N/m

Therefore;

Work done when the extension is 0.4 m, will be;

Work done = 1/2 * 50 * 0.4²

= 4 joules