A staircase contains three steps each \( 10 \mathrm{~cm} \) high and \( \mathrm{P} \) \( 20 \mat...

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A staircase contains three steps each \( 10 \mathrm{~cm} \) high and
\( \mathrm{P} \)
\( 20 \mathrm{~cm} \) wide (figure). What should be the minimum
W
horizontal velocity of a ball rolling off the uppermost plane so as to hit directly the lowest plane?
(1) \( 2 \mathrm{~m} / \mathrm{s} \)
(2) \( 4 \mathrm{~m} / \mathrm{s} \)
(3) \( \sqrt{6} \mathrm{~m} / \mathrm{s} \)
(4) \( 10 \mathrm{~m} / \mathrm{s} \)
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