What is the reading of the physical spring Dynamometer when both sides are pulled with 5N force? What is the reading with 10N force on both sides? What is the reading with 5N force on one side without force? Why

10 n. because the spring dynamometer measures the force on the spring, and the spring only receives the force from one hand
2.5n. Because the force is mutual, if one hand is forced, even if the other side is not forced, it will be forced passively. Just like if you pull your left hand with your right hand, if your left hand is not moved, you will feel forced even if your left hand is not forced, otherwise your left hand will be pulled away

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