The block is initially at rest at \( A \). Assume that collisions b...

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The block is initially at rest at \( A \). Assume that collisions between the block and the incline are totally inelastic. The speed of the block at point \( B \) immediately after it strikes the second incline is
(a) \( \sqrt{60} \mathrm{~m} / \mathrm{s} \)
(b) \( \sqrt{45} \mathrm{~m} / \mathrm{s} \)
(c) \( \sqrt{30} \mathrm{~m} / \mathrm{s} \)
(d) \( \sqrt{15} \mathrm{~m} / \mathrm{s} \)
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