A scientist is studying the properties of a new material. She draws a force-extension graph for the material up to its breaking point. Which statement has to be correct?
- AThe area under the graph from P to R is the strain energy stored in the material.
- BThe area under the graph from P to R is the work done in stretching the material.
- CThe material stretches elastically from Q to R.
- DThe material stretches plastically from P to Q.