2-44.  Identical balls A and B are released at the openings of the hollow vertical shafts in Figure 2-28. The balls strike the bottoms of the two shafts at speeds v_A and v_B, respectively. Suppose we know that v_B = 2 v_A, and air resistance is negligible.

a.   If hA and hB are the depths of the two shafts, hB is then equal to _________ (; between and hA; between hA and 2hA; 2hA; 4hA). b.   If tA and tB are the descent times of the two balls, tB is then equal to _________ ( between and tA; between tA and 2tA; 2tA; 4tA).

Figure 2-28  Problem 2-44

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