The blocks $A$ and $B$ are arranged as shown in the figure. The pulley is frictionless. The mass of $A$ is $10 \,kg$. The coefficient of friction of $A$ with the horizontal surface is $0.20$. The minimum mass of $B $ to start the motion will be...... $kg$
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(a)$\mu = \frac{{{m_B}}}{{{m_A}}}\;\; \Rightarrow \;0.2 = \frac{{{m_B}}}{{10}}\;\; \Rightarrow \;{m_B} = 2\,kg$
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