A block of mass $M$ is pulled along a horizontal frictionless surface by a rope of mass $m$. If a force $P$ is applied at the free end of the rope, the force exerted by the rope on the block will be
$P$
$\frac{{Pm}}{{M + m}}$
$\frac{{PM}}{{M + m}}$
$\frac{{Pm}}{{M - m}}$
Two blocks of mass $M_1 = 20\,kg$ and $M_2 = 12\,kg$ are connected by a metal rod of mass $8\,kg.$ The system is pulled vertically up by applying a force of $480\,N$ as shown. The tension at the mid-point of the rod is ........ $N$
The value of $\frac{T_3}{T_1}$ is .............
For the given figure what will be the contact force applied by $6\ kg$ block on $4\ kg$ block ............ $N$
Two block of masses $7\, kg$ and $5\, kg$ are placed in contact with each other on a smooth surface. If a force of $6\, N$ is applied on the heavier mass, the force on the lighter mass is ............ $N$