- #1

kaspis245

- 189

- 1

## Homework Statement

What force one need to push the box with mass ##m_1## for the box with mass ##m_2## to jump when the force disappears?

## Homework Equations

Newton's second law.

## The Attempt at a Solution

System, when the force is applied:

System, when the force disappears:

##F## is the force, which is applied to the box. This force and ##m_1g## creates the spring force, namely ##kx##. From the second system I can see, that the box with mass ##m_2## will jump only if ##kx## is greater than ##m_2g##, therefore:

##F+m_1g=kx##

##kx=m_2g####F=m_2g-m_1g=g(m_2-m_1)##

Is this correct?