A long plank P of mass 5, kg is placed on a smooth floor. On P is placed a block Q of mass 2, kg . c

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4-2.Friction

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$A$ 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 $10N/kg.$

A

The reaction force on $Q$ due to $P$ is $10N$

B

The acceleration of centre of mass of $P + Q$ system relative to the floor is $(15/7)m/s^2$

C

The acceleration of $P$ relative to the Floor is $2.0\, m/s^2$

D

Both $(B)$ and $(C)$

Solution

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Standard 11

Physics

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