Find acceleration and centripetal force

[isukatphysics69]

Homework Statement

Rank the rate at which the direction of each object's velocity is changing, greatest first.

Homework Equations

n/a

The Attempt at a Solution

I know a centripetal = v^2/r, but i don't have r so i am not sure if i am supposed to just eyeball it and draw a reference circle or not..

 

[mfb]

The objects don't move on a circle, and they don't move at uniform speed either.

What is plotted here? Two spatial dimensions? Blue is the motion I guess. Can you figure out what red is?

 

[isukatphysics69]

The objects don't move on a circle, and they don't move at uniform speed either.

What is plotted here? Two spatial dimensions? Blue is the motion I guess. Can you figure out what red is?

Red is acceleration here I'm sorry i forgot to mention

 

[isukatphysics69]

The objects don't move on a circle, and they don't move at uniform speed either.

What is plotted here? Two spatial dimensions? Blue is the motion I guess. Can you figure out what red is?

i already submitted the assignment, i still have another physics homework and a physics test tomorrow and i am very stressed >=[

submitted that assignment with the wrong answer

 

[mfb]

Red is acceleration

Okay (although it looks odd in (b), there should be an acceleration).
For the change in direction the acceleration along the direction of motion does not matter. Can you find the acceleration orthogonal to it?