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17. A cubical block of side a moving with velocity v on a horizontal smooth the plane as shown in figure. It hits a ridge at point O and starts rotating about the edge in contact with O. The angular speed of the block after it hits O is

$\text{(1)}\frac{\text{3v}}{\text{4a}}\phantom{\rule{0ex}{0ex}}\text{(2)}\frac{\text{3v}}{\text{2a}}\phantom{\rule{0ex}{0ex}}\text{(3)}\sqrt{\frac{3}{2}}\frac{\text{v}}{\text{a}}\phantom{\rule{0ex}{0ex}}\text{(4)Zero}$

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