Physics - NLM Question with Solution | TestHub

In the arrangement shown friction between masses ${\mathrm{m}}_1\&{\mathrm{m}}_2\left({\mathrm{m}}_1=4{\mathrm{m}}_2\right)$ is negligible, but friction is present between ${\mathrm{m}}_1$ & horizontal surface. If acceleration of ${\mathrm{m}}_1$ is found $\frac{\mathrm{g}}{10}$ horizontally, coefficient of friction between ${\mathrm{m}}_1$ & horizontal surface is x/49, then what is the value of x?