A block of mass $5 \mathrm{kg}$ is placed at rest on a table of rough surface. Now, if a force of $30 \mathrm{N}$ is applied in the direction parallel to surface of the table, the block slides through a distance of $50 \mathrm{m}$ in an interval of time $10 \mathrm{s}$. Coefficient of kinetic friction is (given, $g = 10 \mathrm{m} {\mathrm{s}}^{–2}$ ):

As shown in the figure a block of mass $10 \mathrm{kg}$ lying on a horizontal surface is pulled by a force F acting at an angle $30°$, with horizontal. For ${\mu }_s=0.25$, the block will just start to move for the value of $F$: [Given g $= 10 \mathrm{m}·{\mathrm{s}}^{–2}$]

Figures (a), (b), (c) and (d) show variation of force with time.

The impulse is highest in figure.