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A mass of 2 kg initially at a height of ...

A mass of 2 kg initially at a height of 1.2 m above an uncompressed spring with spring constant `2 xx 10^4` N/m , is released from rest to fall on the spring.
Taking the acceleration due to gravity as `10 m//s^2` and neglecting the air resistance , the compression of the spring in mm is

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