Physics - NLM Question with Solution | TestHub

Figure shows a hollow box of mass 10 kg placed on a smooth surface and on its inner surface a small block of mass 5 kg is placed where friction coefficient is $\mathrm{0.2.}\mathrm{F}$ (as shown in the figure) is the minimum force at which 5 kg block starts sliding on the inner surface of box. We now apply a force 2 F on the box instead. Find the time in seconds after which the 5 kg block will hit the other wall of box for the first time. Neglect the length of 5 kg block.