What is the Change in Potential Energy of a Displaced Meter Scale?

[sylwesh98]

A meter scale of mass m initially vertical is displaced at 45 degrees keeping the upper end fixed.
. find out the change in potential energy.

 

[BvU]

Found it. What is your attempt at a solution? And what are the relevant equations ?

 

[sylwesh98]

change in potential energy=mass*acceleration due to gravity * change in height
I can't get the change in height
here change in height is given as (l/2)(1-cos45)
Can u tell me sir!

 

[CWatters]

Try making a drawing. Remember that it's the change in height of the centre of mass that matters.

 

[speedtriple]

I want to say, that I think you have to break it down into its x and y components

 

[sylwesh98]

sir i got it !