A particle of mass $10 \mathrm{kg}$ is moving in a straight line. If its displacement, $x$ with time $t$ is given by $x=\left(t^3-2t-10\right) \mathrm{m}$ then the force acting on it at the end of $4 \mathrm{seconds}$ is

A solid sphere of mass $2 \mathrm{kg}$   is resting inside a cube as shown in the figure. The cube is moving with a velocity  $\overrightarrow{v}=(5\mathrm{t}\hat{\mathrm{i}}+2\mathrm{t}\hat{\mathrm{j}})\mathrm{m} {\mathrm{s}}^{-1}$
Where t is the time in second. All surface are smooth. The sphere is at rest with respect to the cube. What is the total force exerted by the sphere on the cube? (Take $\mathrm{g}=10 \mathrm{m} {\mathrm{s}}^{-2}$  )

Assertion: A table cloth can be pulled from a table without dislodging the dishes.

Reason: To every action, there is an equal and opposite reaction.