The force exerted by the floor of an elevator on the foot for a person standing there is more than the weight of the person if the elevator is,
$\mathrm{A}$. going up with increasing speed,
$\mathrm{B}$. going down with decreasing speed.

The figure shows a uniform rod of mass $3 \mathrm{kg}$ and of length $30 \mathrm{cm}$. The strings shown in figure are pulled by constant forces of $20 \mathrm{N}$ and $32 \mathrm{N}$. The acceleration of the rod is,

Two blocks of masses $M_1$ and $M_2$ are connected to each other through a light spring as shown in figure. If we push mass $M_1$ with force $F$ and cause acceleration $a_1$ in mass $M_1$, what will be the magnitude of acceleration in $M_2$?

Three blocks of masses $2 \mathrm{kg}\text{,} 3 \mathrm{kg}$ and $5 \mathrm{kg}$ are connected to each other with light string and are then placed on a frictionless surface as shown in the figure. The system is pulled by a force, $F=10 \mathrm{N}$. Then the tension $T_1=$

Three masses connected by massless string as shown in figure are placed on a horizontal frictionless surface. Find tensions $T_1$ and $T_2$.