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(A) Given that both blocks $A$ and $B$ move with a constant velocity.Since the velocity is constant,the acceleration of both blocks is zero,i.e.,$a =

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$0$

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(A) Given that both blocks $A$ and $B$ move with a constant velocity.Since the velocity is constant,the acceleration of both blocks is zero,i.e.,$a = 0$.Consider the free-body diagram of block $A$. The only horizontal force acting on block $A$ is the friction force $f$ exerted by block $B$.According to Newton's second law of motion,the net force on block $A$ in the horizontal direction is $F_{net} = m_A \cdot a$.Since $a = 0$,we have $f = m_A \cdot 0 = 0 \, N$.Therefore,the friction force applied by block $B$ on block $A$ is $0 \, N$.

The blocks shown in the figure move with a constant velocity of $10 \, m/s$ towards the right. All surfaces in contact are rough. The friction force applied by block $B$ on block $A$ is ........... $N$.

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