$2\mathrm{.}5$ The coordinate $s$ shown in Figure P $2\mathrm{.}5$ has its origin at node i and a value of $L$ at node $j.$ Develop the shape functions $N_i(s)$ and $N_j(s)$ starting with $(s)=a_1+a_{2}s$ and solving for $a_1$ and $a_2.$

Figure P$2\mathrm{.}5$