Rods \(A B\) and \(A C\) have a diameter of \(20 \mathrm{~mm}\) and are made of 6061-T6 aluminum alloy. They are connected to the rigid collar which slides freely along the vertical guide rod. Determine the maximum height \(h\) from which the \(50 \mathrm{~kg}\) block \(D\) can be dropped from rest without causing yielding in the rods when the block strikes the collar.

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A D h 400 mm 400 mm 30 30 B