Question

Blocks shown in figure moves with constant velocity $10m/s$ towards right. All surfaces in contact are rough. The friction force applied by $B$ on $A$ is:

• A. $0N$
• B. $20N$
• C. $10N$
• D. Insufficient data

Answer 1

The correct option is A $0N$

Given that both block move with constant velocity.

So, $a=0$

$f=m_{A}a=m_A\times 0=0$

$f=0$