Physics - Wave on String Question with Solution | TestHub

A 4 kg block is suspended from the ceiling of an elevator through a spring having a linear mass density of $19.2\times 10^{-3}\mathrm{kg}{\mathrm{m}}^{-3}$. Find the speed with respect to spring with which a wave pulse can proceed on the spring if the elevator accelerates up at the rate of $2.0{\mathrm{ms}}^{-2}$. Take $g=10{\mathrm{ms}}^{-2}$