As shown in the figure, a and B plates are connected by a light spring, and their masses are M1 and M2 respectively How much pressure does it need to add on board a to stop the action of the force, which can make a slightly lift B when jumping up. (set the stiffness coefficient of the spring as K). Thank you ~ ~ the process is more detailed ~ ~ thank you~~ The picture shows a horizontal plate a above, a spring in the middle, and a horizontal plate B below. They are all connected~~

As shown in the figure, a and B plates are connected by a light spring, and their masses are M1 and M2 respectively How much pressure does it need to add on board a to stop the action of the force, which can make a slightly lift B when jumping up. (set the stiffness coefficient of the spring as K). Thank you ~ ~ the process is more detailed ~ ~ thank you~~ The picture shows a horizontal plate a above, a spring in the middle, and a horizontal plate B below. They are all connected~~

Can't see the picture!
Pressure f = m2g