The diagram below shows as instantaneous position of a string as a transverse progressive wave travels along it from left to right Which one of the following correctly shows the direction of the velocity of the points $1,2$ and $3$ on the string
Medium
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Particle velocity $\left(\mathrm{v}_{\mathrm{p}}\right)=-\mathrm{v} \times$ slope of the graph at that point
At point $1:$ Slope of the curve is positive, hence particle velocity is negative or downward $(\downarrow)$
At point $2:$ Slope negative, hence particle velocity is positive or upwards $( \uparrow)$
At point $3:$ Again slope of the curve is positive, hence particle velocity is negative or downward $(\downarrow)$
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