A block starts moving up an inclined plane of inclination $30°$ with an initial velocity of $v_0$. It comes back to its initial position with velocity $\frac{v_0}{2}$. The value of the coefficient of kinetic friction between the block and the inclined plane is close to $\frac{I}{1000}.$ The nearest integer to $I$ is _____.

On a frictionless surface of the variable slope, a block of mass $2 \mathrm{kg}$ at rest is pushed by applying a horizontal constant force of $40 \mathrm{N}$ as shown. The block reaches the top and leaves the surface and falls under gravity alone. It strikes the surface some distance away with a speed of,

The adjoining diagram shows the velocity versus time plot for a particle. The work done by the force on the particle is positive from,

A block of mass $m$ is sliding down an inclined plane with constant speed. At a certain instant $t_0$, its height above the ground is $h$. The coefficient of kinetic friction between the block and the plane is $\mu$. If the block reaches the ground at a later instant $t_g$, then the energy dissipated by friction in the time interval $\left(t_g-t_0\right)$ is