A staircase contains three steps each of \( 10 \mathrm{~cm} \) high...
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A staircase contains three steps each of \( 10 \mathrm{~cm} \) high and \( 20 \mathrm{~cm} \) wide (figure). What should be the
\( \mathrm{P} \) minimum horizontal velocity of a ball rolling off
W the uppermost plane so as to hit directly the lowest plane:
(1) \( 1 \mathrm{~m} / \mathrm{s} \)
(2) \( 1.5 \mathrm{~m} / \mathrm{s} \)
(3) \( 2 \mathrm{~m} / \mathrm{s} \)
(4) \( 3 \mathrm{~m} / \mathrm{s} \)
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