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A horizontal force F pushes a 4kg block ...

A horizontal force `F` pushes a `4kg` block `(A)` which pushes against a `2kg` block `(B)` as shown The have an acceleration of `3m//s^(2)` to the right There is no friction between the blocks and the surface on which they slide. What is the net force `B` exerts on `A`
.

A

`6 N` to the right

B

`12 N` to the right

C

`6 N` to the left

D

`12 N` to the left

Text Solution

Verified by Experts

The correct Answer is:
C
`F =ma, F_("net") =F -f, f =ma`
`a =(T_(3))/(m_(1)+m_(2)+m_(3)),T_(2)=(m_(1)+m_(2))a` .
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