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A 4-kg box and a 2-kg box can move on the horizontal frictionless surface. The box are accelerated by a +12-N force that pushes the
larger box against the smaller one. Determine the force that the 2-kg box exerts on the 4-kg box.
+12 N
...
4 kg
|2 kg
A) +8N
-4N
ON
D) -8N
+4N

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