# physics

an unstretched hanging spring is 50cm long. suspending a 100N weight from it makes its lenght 60cm. Adding another 100N weight will make the spring --
60cm, 70 cm, 80 cm, 100 cm, or 120 cm.

No idea how they came up with any of the five ??? My answer was different!

1. 👍 0
2. 👎 0
3. 👁 462
1. The amount of stretching is proportional to the weight applied. That's called Hooke's law.

Since 100N stretches the spring 10 cm, 200 N will stretch it 20 cm. Add that to the original unstretched length.

50 + 20 = ___ cm

1. 👍 1
2. 👎 0
posted by drwls

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