Blocks shown in figure moves with constant velocity $10 \,m / s$ towards right. All surfaces in contact are rough. The friction force applied by $B$ on $A$ is ...........$N$
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(a)
Given that both block move with constant velocity.
So, $a =0$
$f = m _{ A } a = m _{ A } \times 0=0$
$f=0$
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