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Answer:
The mass M of the pan is 80g
Explanations:
The mass M of the pan is 80 g.
This means that when a 40 g mass is placed on the pan, a spring stretches in a certain way.
When this mass is replaced with a 60 g mass, the spring stretches differently.
By comparing these two stretches, we can calculate that the mass of the pan is 80 g.
