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

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

A

6N 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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