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January 28, 2015

January 28, 2015

Posted by **Jen** on Monday, July 12, 2010 at 10:24pm.

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!

Please help!

- physics -
**drwls**, Monday, July 12, 2010 at 10:43pmThe 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

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