A truck starting from rest moves with an acceleration of $5\,m / s ^2$ for $1 sec$ and then moves with constant velocity. The velocity w.r.t. ground v/s time graph for block in truck is (Assume that block does not fall off the truck)
None of these
When $F =2 N$, the frictional force between 5 $kg$ block and ground is $..........\,N$
A balloon with mass $'m'$ is descending down with an acceleration $'a'$ (where $a < g$ ). How much mass should be removed from it so that it starts moving up with an acceleration $'a'$ ?
Two masses of $1\, kg$ and $5\, kg$ are attached to the ends of a massless string passing over a pulley of negligible weight. The pulley itself is attached to a light spring balance as shown in figure. The masses start moving during this interval; the reading of spring balance will be
A road is $10\, m$ wide. Its radius of curvature is $50\, m$. The outer edge is above the lower edge by a distance of $1.5\, m$. this road is most suited for the velocity ........ $m/s$
A block of mass $m$ lying on a rough horizontal plane is acted upon by a horizontal force $P$ and another force $Q$ inclined an at an angle $\theta$ to the vertical. The minimum value of coefficient of friction between the block and the surface for which the block will remain in equilibrium is :