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A certain spring stretches 25 cm when a ...

A certain spring stretches 25 cm when a 500 g mass is hung from its end. It is now used as shown in fig. With 2 kg mass at one end placed on a frictionless surface. Suppose the mass is pulled to the right until the spring is stretched to 10 cm and then released. find the speed with which the mass moves through the unstretched position.

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