A spring scale hung from the ceiling stretches by $5\mathrm{.}4$ cmcm when a $1\mathrm{.}8$ kgkg mass is hung from it$.$ The $1\mathrm{.}8$ kgkg mass is removed and replaced with a $2\mathrm{.}0$ kgkg mass.

Part A

What is the stretch of the spring?

Express your answer with the appropriate units.

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