I hope someone's help.(adsbygoogle = window.adsbygoogle || []).push({});

If someone has some idea of following thing, please write your idea here.

[tex]Problem[/tex]: There is a spring(spring constant: [tex]k[/tex]) fixed on the floor with massless board fixed upside of it. Peter put a box of [tex]m(kg)[/tex] on the board and make spring in a state of equilibrium.Peter want to make the box off from the board. What is the least value of [tex]x[/tex], the distance Peter should press the spring, to make box off from the board?

I hope a proof using forces, such as gravity, spring force, and [tex]N[/tex] or using Energy, such as [tex]mgh, \frac{1}{2} kx^2[/tex], etc..

Can anyone help me?

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# Homework Help: A difficult mechanic problem with spring

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