Final answer:
When you push against a tree with a force of 15 N directed to the left, the tree exerts an equal and opposite force of 15 N on you towards the right.
Step-by-step explanation:
When you push against a tree with a force of 15 N directed to the left, the tree exerts an equal and opposite force of 15 N on you, based on Newton's Third Law of Motion. The magnitude of the force is 15 N, and since it is directed towards the right, the force is also directed to the right.
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