# If the length of a #49 cm# spring increases to #73 cm# when a #5 kg# weight is hanging from it, what is the spring's constant?

##### 1 Answer

May 29, 2018

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#### Explanation:

We use Hooke's law, which states that,

where:

#F# is the force in newtons

#k# is the spring constant in newtons per meter or kilograms per second squared

#x# is the extension in meters

So, we get: