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A block of mass m is pushed up against a...

A block of mass `m` is pushed up against a spring, compressing it a distance `x`, and the block is then released. The spring projects the block along a frictionaless horizontal surface, grving the block a speed `v`. The same spring projects a second block of mass `4m`, giving it a speed `3v`. What distance was the spring compressed in the second case ?

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