Physics (AS & A Level) · May / June 2025 · Paper 14 · Question 18

A spring of unstretched length 0.10 m is suspended vertically from a support. A weight of 2.0 N is attached to the bottom of the spring and its length increases to 0.15 m. An additional weight of 4.0 N is then added to the bottom of the spring. The spring obeys Hooke’s law. How much extra elastic potential energy is stored in the spring due to the addition of the 4.0 N weight?

1. A0.067 J
2. B0.13 J
3. C0.20 J
4. D0.40 J

As printed in the paper