A trianguler pulse moving at $2\ cm/s$ on a rope approches an end at which it is free to slide on vertical pole. What is the particle speed at the free end at $\frac{3}{4}\ sec$ from the instant shown ...... $cm/s$
Diffcult
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particle speed $=-\mathrm{v}_{\mathrm{w}} \times$ slope
$=2 \times(2 / 1)$ at $\frac{3}{4} \mathrm{\,sec}$
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