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## Homework Statement

Two People are holding the ends of a uniform plank of lenth, l and mass, m. Show that if one person suddenly lets go, the load suppored by the other person suddenly drops from mg/2 to mg/4.

## Homework Equations

Fnet=ma

L=Iw'

I=ml^2+I'

## The Attempt at a Solution

I have done the first part of the problem. I am have trouble with the second part.

Before Plank Falls:

Fnet = ma = F1 + F2 -Fg = 0 (F1=F2, Fg=mg)

2F1=mg

F1=(mg)/2

After Plank Falls:

Fnet = ma = F1 - Fg = 0

F1=mg