13-09-2019
Physics

contestada

does anyone know how to do this?

does anyone know how to do this class=

Respuesta :

annaise20 annaise20

14-09-2019

Explanation:

By Hooke's Law,

F=kx

The only force acting here is weight, and x is the extension of the string (you need to convert this to mm) so

mg=kx

(0.15)(9.81)=k ((420-300)x10^-3)

Then just solve this equation.

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