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Two identical containers, P and Q, are partly filled with different quantities of sand.

The position of the centre of gravity for each container is labelled X.

Which container is more stable and what is the reason why it is more stable?

1 ) 

P is more stable because it has a lower centre of gravity.

2 ) 

P is more stable because it has a smaller mass.

3 ) 

Q is more stable because it has a greater depth of sand.

4 ) 

Q is more stable because it has a higher centre of gravity.

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