A stationary body of mass $m$ is slowly lowered onto a massive plateform of mass $M(M \gg m)$ moving at a speed $V_p=4\,m / s$ as shown in fig. How far will the body slide along the platform $(\mu=0.2$ and $g =10\,m /\left.s ^2\right)$ ?

A block placed on a rough horizontal surface is pulled by a horizontal force $F$. Let $f$ be the force applied by the rough surface on the block. Plot a graph of $f$ versus $F$.

A body of weight $64\, N$ is pushed with just enough force to start it moving across a horizontal floor and the same force continues to act afterwards. If the coefficients of static and dynamic friction are $0.6$ and $0.4$ respectively, the acceleration of the body will be (Acceleration due to gravity $= g$)

It is difficult to move a cycle with brakes on because

Which of the following is a self adjusting force?

A body of mass $40\,kg$ resting on rough horizontal surface is subjected to a force $P$ which is just enough to start the motion of the body. If $\mu_{ s }=5, \mu_{ x }=0.4$, $g =10\,m / s ^2$ and the force $P$ is continuously applied on the body, then the acceleration of the body is $.........m/s^{2}$