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The force you are exerting to stretch it, and the restoring force of the spring.
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When you pull on the scale you stretch the spring the pointer on the scales moves as you pull to measure the force you are using you have to be able to lift or pull on the spring scale
That depends on the spring.
elaborate
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It depends on spring energy or spring strength
since the springs share the load the stretch displacement is load divided by the sum of the spring constants. If the springs are identical the stretch is one half of the stretch with only the one spring, or 2.5 cm
depends on the initial length of the spring, and how much force is required to stretch the spring
It may loose its elastic nature.
Springs are great for absorbing energy. The spring force is negative when the spring is stretched and positive when it is compressed or pushed.
elastic energy..