Physics - NLM Question with Solution | TestHub

A plank of length 20 m and mass 1 kg is kept on a horizontal smooth surface. A cylinder of mass 1 kg is kept near one end of the plank. The coefficient of friction between the two surfaces is 0.5. Plank is suddenly given a velocity 20 m/s towards left. Find the time (in sec) at which plank and cylinder separate.