• # question_answer A block of mass m is connected to another block of mass M by a spring (massless) of spring constant k. The blocks are kept on a smooth horizontal plane. Initially the blocks are at rest and' the spring is upstretched.Then, a constant force F starts acting on the block of mass M to pull it; Find the force on the block of mass m. [AIEEE 2007] A) $c=x\hat{i}+(x-2)\hat{j}-\hat{k}$ B) $x$ C) $R=(3,3\sqrt{3})$ D) $\angle PQR$

 [c] Acceleration of system, $\frac{\sqrt{3}}{2}x+y=0$ So, force acting on mass$x+\sqrt{3}y=0$