Not sure for part A or B Please help ! Thanks!!! Consider the waves in the figur

Question

Not sure for part A or B

Please help !

Thanks!!!

Consider the waves in the figures below to be waves on a stretched string. Define the velocity of elements of the string as positive if they are moving upward in the figures. At the moment the string has the shape shown by the red-brown curve in the column of figures on the left (f = 0) above, what is the instantaneous velocity of elements along the string? It is zero for all elements. It is positive for all elements. It is negative for all elements. It varies with the position of the element. At the moment the string has the shape shown by the red-brown curve in the column of figures in the center (t = T/4) above, what is the instantaneous velocity of elements along the string? It is zero for all elements. It is positive for all elements. It is negative for all elements. It varies with the position of the element.

Explanation / Answer

a)

the correct option is ,

"it varies with position of the element"

here,

at node point velocity is zero

at antinode point velocity is varies

b)

the correct option is,

"it is zero for all elements"

here,

velocity of the given wave at t=T/4 is zero

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