In the arrangement shown below, two trucks A and B are held in position with spring compressed. When they are released and the spring has fallen away, A is found to be moving to the left at 2 m/s. The energy stored in the compressed spring was

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In the arrangement shown below, two trucks A and B are held in position with spring compressed. When they are released and the spring has fallen away, A is found to be moving to the left at 2 m/s. The energy stored in the compressed spring was