A cantilever of length l, and flexural rigidity El, stiffened by a spring of stiffness k, is loaded by a transverse force P, as shown.
The transverse deflection under the load is1
\(\frac{{P{l^3}}}{{3EI}}\left[ {\frac{{3EI}}{{3EI\;+\;2k{l^3}}}} \right]\)
2
\(\frac{{P{l^3}}}{{3EI}}\left[ {\frac{{6EI\;-\;k{l^3}}}{{6EI}}} \right]\)
3
\(\frac{{P{l^3}}}{{3EI}}\left[ {\frac{{3EI\;-\;k{l^3}}}{{3EI}}} \right]\)
4
\(\frac{{P{l^3}}}{{3EI}}\left[ {\frac{{3EI}}{{3EI\;+\;k{l^3}}}} \right]\)
5
Question Not Attempted