A transverse wave is travelling along as string from left to right, Fig. below represents the shape of the string at a given instant. Al this instant
(a) which points have an upward velocity?
(b) which points will have downward velocity ?
(c) which points have zero velocity ?
(d) which points have maximun magnitude of velocity

Explanation

For maximum magnitude of of velocity `abs("slope")`= maximum which is at A and E.