Two blocks A and B are joined together with a compressed spring. When the system is released, the

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Two blocks A and B are joined together with a compressed spring. When the system is released, the two bloks appear to be moving with unequal speeds in the opposite directions as shown in figure. Select incorrect statements(s) :
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how can we know that they will reach the maximum elongation point together? We can only know that for sure in frame of COM.

Surwur