Answer:

$5.$ An aeroplane while landing, deflects its suspension springs $2$ mm under static conditions. Assuming, the aeroplane has a mass of $8000$ kg $,$ and the equation of the motion is$,m{x}^{}+c{x}^{}+kx=0.$ Determine the equivalent stiffness, $k_{eq}$ in $\frac{N}{m}$ of the suspension system. Take $g=9\mathrm{.}81\frac{m}{s^2}.[14\mathrm{.}0$ MARKS$]$