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 horizontal force F pushes a 4 kg block (A) which pushes against a 2

1.	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 ?
Answer» 6N to the right 12 N to the right 6 N to the left 12 N to the left Solution :`F=ma, F_("NET")=F-f, f=ma` `a=(T_(3))/(m_(1)+m_(2)+m_(3)), T_(2)=(m_(1)+m_(2))a`