Pseudo Force

In the arrangement shown, system consisting of a wedge (slipping down the incline) and block $A.$ The direction of pseudo force acting on $A$ in frame of wedge is

If the resultant force acting on a moving body is zero, then

In the shown figure, the trolley move with constant acceleration $a$ and the string connecting the masses $m_1$ and $m_2.$

Make constant angles ${\theta }_1$ and ${\theta }_2.$ If$m_1=m_2=m,$ then

A pendulum bob is suspended from the roof of a car moving on a horizontal road with an acceleration $a.$ The angle made by string with the horizontal is

In the given figure the co-efficient of friction between the block and the incline plane is $\text{'}1\text{'}.$ The acceleration with which the system should be accelerated so that the friction between the block and the wedge becomes zero $\left(g=10 \mathrm{m} {\mathrm{s}}^{-2}\right)$ is

A block of mass $2 \mathrm{kg}$ rest on the floor of an elevator. Which is moving down with an acceleration $\text{'}g\text{'}.$ Then the apparent weight of the block is (take, $g=10 \mathrm{m} {\mathrm{s}}^{-2}$ )

Blocks $A$ and $C$ start from rest and move to the right with acceleration $a_A=12t \mathrm{m} {\mathrm{s}}^{-2}$ and $a_C=3 \mathrm{m} {\mathrm{s}}^{-2}$. Here $t$ is in seconds. The time when block $B$ again comes to rest is