A spring toy weighing $1 \mathrm{kg}$ on a spring balance suddenly jumps upward. A boy standing near the toy notices that the scale of the balance reads $1.05 \mathrm{kg}$. In this process, the maximum acceleration of the toy is $\left(g=10 \mathrm{m} {\mathrm{s}}^{-2}\right)$,

A dynamometer $D$ is connected with two bodies of masses, $M=6 \mathrm{kg}$ and $m=4 \mathrm{kg}$. If two forces $F=20 \mathrm{N}$ and $F=10 \mathrm{N}$ are applied on masses according to figure, then the reading of the dynamometer will be,

In the given figure, what is the reading of the spring balance?

A massless spring balance is attached to $2 \mathrm{kg}$ trolley and is used to pull the trolley along a flat surface as shown in the figure. The reading on the spring balance remains at $10 \mathrm{kg}$ during the motion. The acceleration of the trolley is (use, $g=9.8{ \mathrm{m} \mathrm{s}}^{-2}$),

Two masses of $1 \mathrm{kg}$ and $2 \mathrm{kg}$, respectively, are connected by a massless spring as shown in figure. $A$ force of $20 \mathrm{N}$ acts on the $2 \mathrm{kg}$ mass at the instant when the $1 \mathrm{kg}$ mass has an acceleration of $10{ \mathrm{m} \mathrm{s}}^{-2}$ towards right. The acceleration of the $2 \mathrm{kg}$ mass is,

The system shown in figure is in equilibrium and at rest. The spring and string are massless. Now, the string is cut. The acceleration of mass $2m$ and $m$ just after the string is cut will be,