Why Wasn't (0,-3) Included in the Initial Graph of a Traveling Sinusoidal Wave?

[member 731016]

Homework Statement

Please see below

Relevant Equations

y = Asin(kx - ωt)

For part(a) of this problem,

The solution is,

However, why did they not have a point at (x,y) = (0, -3) initially? Also why did they not do a y against time graph?Many thanks!

 

[BvU]

why did they not have a point at (x,y) = (0, -3) initially?

You sure they don't ?

$\$

 

[kuruman]

Homework Statement:: Please see below
Relevant Equations:: y = Asin(kx - ωt)

However, why did they not have a point at (x,y) = (0, -3) initially?

Your question is meaningless without units. See query by @BvU.

 

[member 731016]

Sorry @kuruman and @BvU, I see my mistake.

Kind regards,
Callum