A horizontal force F pushes on a 4  kg block (A) which pushes against a 2  kg block (B) as shown....

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A horizontal force F pushes on a 4  kg block (A) which pushes against a 2  kg block (B) as shown. The blocks have an acceleration of 3  m / 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. 6 N to the right
b. 12 N to the right
c. 6 N to the left
d. 12 N to the left

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is normal force acting on a body is always equal to normal force exerted by the object on another body?

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