In question number math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn4/mn/math ...

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In question number math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn4/mn/math , if the collision between the block and the incline is completely elastic, then the vertical (upward) component of the velocity of the block at point \( B \), immediately after it strikes the second incline is
(a) \( \sqrt{30} \mathrm{~m} / \mathrm{s} \)
(b) \( \sqrt{15} \mathrm{~m} / \mathrm{s} \)
(c) math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn0/mn/math
(d) \( -\sqrt{15} \mathrm{~m} / \mathrm{s} \)
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