A mass m is added to a vertical spring that is initially unextended, as shown in Diagram 1.
The mass is then lowered until it hangs stationary on the spring, as shown in Diagram 2.
The extension of the spring is now ΔL.
How much energy is transferred from the mass–spring system?

$\frac{{mgΔL}}{2}$
2 )
mgΔL
3 )
$\frac{{3mgΔL}}{2}$
4 )
2mgΔL
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