"Velocity" means the speed the object (or in this case wave) is moving at in a certain direction.
But I don't know how to obtain the value of Velocity from the graph (that I still do not know how to draw).
Homework Statement
Open Question 2.bmp
Homework Equations
The Attempt at a Solution
Open Answer 2.bmp
I really struggled with this one, my answer is nothing more than an incomplete educated guess.