A body of mass $40 \mathrm{g}$ is moving with a constant velocity of $2 \mathrm{cm} {\mathrm{s}}^{-1}$ on a horizontal frictionless table. The force on the table is:

The $50 \mathrm{kg}$ homogeneous smooth sphere rests on the $30°$ incline $A$ and bears against the smooth vertical wall $B.$ The contact forces at $A$ and $B.$

A mass $\mathrm{M}$ is suspended by a rope from a rigid support at $A$ as shown in figure. Another rope is tied at the end $B,$ and it is pulled horizontally with a force $F.$If the rope $AB$ makes an angle $\theta$ with the vertical in equilibrium, then the tension in the string $AB$ is :