Dadface
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cmb said:Yes, sorry, it was. If a mass passes through 'x' displacing a spring until it reaces zero acceleration (thus, the mass reaches a point where it is finally acting on the spring with Mg of force) then it means it is at its centre of SHM. In other words, it is moving. And, guess what, indeed the energy in the spring at the time will be 0.5Mgx, just as the kinetic energy of the mass with be the other 0.5Mgx. That kinetic energy will keep the mass falling, extending the spring to '2x' (in your dimensional terms), thus storing a total of 2Mgx of energy in the spring once the mass decelerates to zero velocity at the 'bottom' of its SHM - just before it gets pulled back up by the energy stored [NOT lost] in the spring.
It's all elementary SHM.
Did you actually read my posts?tThe energy value I quoted was when the mass reached its final static extension this being after the vibrations die down due to damping.