The answer will depend on the unstretched length of the spring and its Young's modulus.
depends on the initial length of the spring, and how much force is required to stretch the spring
The ratio of force applied to how much the spring streches (or compresses). In the SI, the spring constant would be expressed in Newtons/meter. A larger spring constant means the spring is "stiffer" - more force is required to stretch it a certain amount.
There is 15 centimeters in 15 centimeters
There are 10 centimeters in 10 centimeters.
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Measure how many newtons of pull you need in order to stretch the springtwo centimeters longer. Then the spring constant is1/2 of (that number of newtons) per centimeter, or50 x (that number of newtons) per meter.======================================US, Liberian, and Burmese version:Measure how many ounces of pull you need in order to stretch the springone inch longer.Then the spring constant is (that number of ounces) per inch .
The force you are exerting to stretch it, and the restoring force of the spring.
The answer will depend on the unstretched length of the spring and its Young's modulus.
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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
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
Grass 8 to 11 centimeters, Hard Floor 8 to 12 centimeters, Spring Floor 10 to 15 centimeters
depends on the initial length of the spring, and how much force is required to stretch the spring