Physics - NLM Question with Solution | TestHub

Two blocks $A$ and $B$ of masses 4 kg and 6 kg are connected by spring of unknown spring constant. There are no external forces in horizontal direction on the system containing $\mathrm{A},\mathrm{B}$ and spring. If at a moment acceleration of $B$ is $1.5\mathrm{m}/{\mathrm{s}}^2$ leftward and magnitude of acceleration of $A$ is x$\mathrm{m}/{\mathrm{s}}^2$. Find 4x.