The nail exerts the exact force of 200N back to the hammer.
A force is a push or a pull. It is the external force exerted on a body to either change its position or its direction.
Newton's third law states that for every action (force) in nature there is an equal and opposite reaction.
If object A exerts a force on object B, object B also exerts an equal and opposite force on object A.
In conclusion, according to Newton's third law, the nail would be exerting the same amount of force the hammer exerted on it.
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