Ideal spring with const k is.Hung frkm ceiling and blovk.Of mass m attached to it lowe end the mass is released with spring initially unstretched then max extension in spring is
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Since the spring is unstretched initially then the spring will start getting stretched due to the weight of the object.
suppose if the spring gets stretched x' units then a restoring force of kx' will act against the weight of the object then the net force acting on the spring
F= (mg - kx)
The spring will be max stretched when the net force will be 0 because after that there will be no more stretching so if the max stretching is x" then
Kx" = mg
Or, x" = mg/k
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