As the heavy 6-shooter slides rightward along a rough oak plank, its mass is pul

Question

As the heavy 6-shooter slides rightward along a rough oak plank, its mass is pulled downward by Earth's gravity field (causing its weight).
Which of these Forces is the "Newton's 3rd Law" pair for this weight Force?    

1.the plank's friction pushing the gun leftward. 2.Earth pushing the plank upward. 3.the gun pushing the plank downward. 4.the plank pushing the gun upward.     5.the gun's friction pushing the plank rightward. 6.the gun pulling Earth upward. 7.the plank pushing Earth downward. 8.the gun is moving, so there is no 3rd-Law pair. 9.the gun is accelerating, so there is no 3rd-Law pair.

Explanation / Answer

6.the gun pulling Earth upward.

both gun and plank exert gravitational force on eace other of equal amount but in opposite direction.
earth pulls gun downward and gun pulls earth upward.

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