A body starts from rest with uniform acceleration and acquires a velocity $V$ in time $T.$ The instantaneous kinetic energy of the body after any time $t$ is proportional to:

A force $F$ acting on an object varies with distance $x$ as shown here. The force is in $\mathrm{N}$ and $x$ is in $\mathrm{m}.$ The work done by the force in moving the object from $x=0$ to $x=6 \mathrm{m}$ is

A block weighing $10 \mathrm{N}$ travles down a smooth curved track $AB$ joined to a rough horizontal surface (figure). The rough surface has a friction coefficient of $0.20$ with the block. If the block starts slipping on the track from a. point $1.0 \mathrm{m}$ above the horizontal surface, the distance it will move on the rough surface is:

The graph between the resistive force $F$ acting on a body and the distance covered by the body is shown in the figure. The mass of the body is $25 \mathrm{kg}$ and the initial velocity is $2 \mathrm{m} {\mathrm{s}}^{-1}.$ When the distance covered by the body is $4 \mathrm{m},$ its kinetic energy would be