At a given instant, \( A \) is moving with velocity of \( 5 \mathrm...

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At a given instant, \( A \) is moving with velocity of \( 5 \mathrm{~m} / \mathrm{s} \) upwards. What is velocity of \( \mathrm{B} \) at the time
\( \mathrm{P} \) mennumunnumunumunnumui
(1) \( 15 \mathrm{~m} / \mathrm{s} \downarrow \)
(2) \( 15 \mathrm{~m} / \mathrm{s} \uparrow \)
(3) \( 5 \mathrm{~m} / \mathrm{s} \downarrow \)
(4) \( 5 \mathrm{~m} / \mathrm{s} \uparrow \)
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