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Springs without mass, that satisfies the Hooke’s law. *d* is the length that the spring is stretched or compressed. If the spring is stretched *d* is positive, if is compressed is negative. Allow one or two forces (not frictions). If have two forces these must have different sense (stretching or compressing the spring), and the same values or unknown data.

Equations: | 1. |

Data: | |
---|---|

k: | Spring constant. |

d: | Length that the spring is stretched or compressed. |