Physics paper may june 2010_11 help

[Venkata Gurrala]

Going through question 21 about the graph which represents the relationship of a rubber band that is stretched to its breaking point, i realized that the graph similar to B was in my book so i chose the answer. I dont get how the answer is A.

 

[Thought blocker]

for polymeric materials ( ex rubber)....after the elastic limit and before the breaking point, a large increase in the Force cause a small increase in the extension...so A is the graph wich supports this idea..and besides u must know what is the shape of a force-extension graph for each type of material ( brittle, ductile, and polymeric).