The diagram shows an 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 velocity of points 1,2 and 3 on the string?
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Text Solution
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Particle velocity 
Slope of the graph at that point.
At point 1 Slope of the curve is positive, hence particle velocity is negative or downward ( 
).
At piont 2 Slope negative, hence particle velocity is positive or upwards ( 
).
At point 3 Again slope of the curve is positive, hence particle velocity is negative or downward ( 
).
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