A Level Mechanics help please!

Hi, would anyone be able to help me with this?
I've got an answer of 1.8m and that doesn't seem right as the plank is only 2m long.

here's the question:
A non-uniform plank AB of mass 20 kg and length 2 m is pivoted at its midpoint.
The plank is in equilibrium in a horizontal position when a particle of mass 5 kg is placed 40 cm from A and another particle of mass 8 kg is placed 30 cm from B.
Find the distance of the centre of mass of the plank from A


thank youuu

Hi, would anyone be able to help me with this?
I've got an answer of 1.8m and that doesn't seem right as the plank is only 2m long.

here's the question:
A non-uniform plank AB of mass 20 kg and length 2 m is pivoted at its midpoint.
The plank is in equilibrium in a horizontal position when a particle of mass 5 kg is placed 40 cm from A and another particle of mass 8 kg is placed 30 cm from B.
Find the distance of the centre of mass of the plank from A


thank youuu

Not sure if it’s right but this is how I would do it!

Not sure if it’s right but this is how I would do it!

ohh i always forget about gravity! thank you so much, i understand now

Sorry would you please be able to delete this post? I wasn’t aware of the rules

I wasn’t aware of the rules

sorry, what rules?

Maths forum posting guidelines, covers asking and responding to questions - see here

thank you! sorry i never meant to break any rules