Three different materials, chalk, plastic and silly putty, are tested in tension

using test specimens having diameters of $0\mathrm{.}5$ inches and gage lengths of $2$

inches. At failure the distances between the gauge marks are found to be $2\mathrm{.}02,$

$2\mathrm{.}1$ and $4\mathrm{.}0$ inches, respectively. At failure, the cross section diameters were

$0\mathrm{.}49,0\mathrm{.}4$ and $0\mathrm{.}18$ inches, respectively. Determine the percent elongation and

percent reduction in area of each specimen and then classify each material as

brittle or ductile.