The block is released from rest on rough incline as shown. Maximum compression in spring is $\left[g=10 \mathrm{m} {\mathrm{s}}^{-2}\right]$

A block of mass $5 \mathrm{kg}$ is released from rest when compression in spring is $2 \mathrm{m}$. Block is not attached with the spring and natural length of the spring is $4 \mathrm{m}$. Maximum height of block from ground is$\left(g=10 \mathrm{m} {\mathrm{s}}^{-2}\right)$

A horse drinks water from a cubical container of side $1 \mathrm{m}.$ The level of the stomach of horse is at $2 \mathrm{m}$ from the ground. Assume that all the water drunk by the horse is at a level of $2 \mathrm{m}$ from the ground. Then minimum work done by the horse in drinking the entire water of the container is (take ${\rho }_{\text{water }}=1000 \mathrm{kg} {\mathrm{m}}^{-3}$ and $g=10 \mathrm{m} {\mathrm{s}}^{-2}$)

A simple pendulum of length $L$ is suspended from the top of a flat beam of thickness $\frac{L}{2}$ The bob is pulled away from the beam so that it makes an angle $\theta$ with the vertical as shown in the figure. It is then released from rest. If $\varphi$ is the maximum angular deflection to the right, then

The force acting on the system is represented against distance $r$ as shown. The potential energy of the system will be best represented by. (At $x=0,$ potential energy $=0$) 

In the figure shown the potential energy $U$ of a particle is plotted against its position $x$ from origin. Then which of the following statement is correct. A particle at: