Question

If the length of a `21 cm` spring increases to `36 cm` when a `8 kg` weight is hanging from it, what is the spring's constant?

Answer 1

`K=523.2 " "N/m`

Explanation:

`Delta x=36-21=15 cm=0.15 m`
`G=m*g=8*9.81=78.48N" Force which it stretches the spring"`
`F=-K*Delta x " the sign '-' shows direction"`

`F:"force which it calls back"`
`K:"Spring constant"`

`-F=G`

`78.48=K*0.15`

`K=(78.48)/(0.15)`

`K=523.2 " "N/m`