- #1

yecko

Gold Member

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## Homework Statement

http://i.imgur.com/TdPWVgr.png

## Homework Equations

WD=mgh

## The Attempt at a Solution

mass per length=0.8kg/m

mgh= ∫(0,10)(0.8g(10-y))dy=[8gy-0.4y^2g](0,10)=80g-40g=40g

However, the answer is 20g

whats wrong with my calculation?

thanks