The dimensions of kinetic energy is-

The diagram shows a barrel of weight $1.0\times {10}^3 \mathrm{N}$ on a frictionless slope inclined at $30°$ to the horizontal.

The force is parallel to the slope. Whet is the work done in moving the barrel a distance of $5.0 \mathrm{m}$ up the slope?

Assertion $\left(A\right)$ : The work done by the electrostatic force is zero when a point charge moves in a circular path around another charge.

Reason $\left(R\right)$ : The dot product of force and displacement vectors gives work done.

A block of mass $2 \mathrm{kg}$ is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force, $F=40\mathrm{ }\mathrm{N}$. The kinetic energy of the particle increases $40\mathrm{ }\mathrm{J}$ in a given interval of time. Then, which of the following is/are correct? (Take the value of $g=10\mathrm{ }\mathrm{m} {\mathrm{s}}^{-2}$.)

If a block of mass $2 \mathrm{kg}$ is displaced by $10 \mathrm{m}$ towards right by the application of force $F$, as shown in figure, then work done by force $F$ is

When a spring is _____, work done by the force is positive.

(Choose from: compressed/stretched)

A man, of mass $m$, standing at the bottom of the staircase, of height $L$ climbs it and stands at its top.