A spring hangs from the ceiling with an unstretched length of x$0=0\mathrm{.}91$ m$.$ A m$,=5\mathrm{.}5$ kg block is hung from the spring, causing the spring to stretch to a length x$,=1\mathrm{.}10$ m$.$ Find the length Ax of the spring when a m$2=1\mathrm{.}7$ kg block is hung from the spring. For both cases, all vibrations of the spring are allowed to settle down before any measurements are made.