AP Physics 1
2.8 Spring Forces
2.5 Newton’s Second Law
2.4 Newton’s First Law
2.2 Forces and Free-Body Diagrams
An elastic cord is \(80\,\text{cm}\) long when it is supporting a mass of \(10.\,\text{kg}\) hanging from it at rest. When an additional \(4.0\,\text{kg}\) is added, the cord is \(82.5\,\text{cm}\) long.
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