$A$ long plank $P$ of the mass $5\, kg$ is placed on a smooth floor. On $P$ is placed a block $Q$ of mass $2\, kg$. The coefficient of friction between $P$ and $Q$ is $0.5$. If a horizontal force $15N$ is applied to $Q$, as shown, and you may take $g$ as $10N/kg.$
When $F = 2N$, the frictional force between $5 kg$ block and ground is …… $N$
…….. $N$ the maximum force for which both the block will move with same acceleration.
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