Question

Question on physics image included

Answer 1

I tried to use the F=MA, where F = 12, and m = 2 and I got 6 but apparently its 4.

Answer 2

Since both of the blocks are being moved by the force, you need to consider the blocks collectively, and thus the sum of their masses.\[F = (m_A + m_B)a \longrightarrow \boxed{a = \dfrac{F}{m_A + m_B}}\]Does that make sense?

Answer 3

Yes I get it, thank you!