At a given instant, \( \mathrm{A} \) is moving with velocity of \( ...

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At a given instant, \( \mathrm{A} \) is moving with velocity of \( 5 \mathrm{~m} / \mathrm{s} \) upwards. What is velocity of \( \mathrm{B} \) at the time
(a) \( 15 \mathrm{~m} / \mathrm{s} \downarrow \)
(b) \( 15 \mathrm{~m} / \mathrm{s} \uparrow \)
(c) \( 5 \mathrm{~m} / \mathrm{s} \downarrow \)
(d) \( 5 \mathrm{~m} / \mathrm{s} \uparrow \)
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