In the circular motion below, what will be the velocity?

[HCverma]

Homework Statement

In circular motion what will be the change in velocity if initial velocity and final velocity is 2 m/s? From the left, in the 3rd diagram, if initial velocity and final velocity is 2 m/ s then what is the change in velocity? t = 5 s

Homework Equations

The Attempt at a Solution

the answer should be.
Acceleration = Vf - Vi / t = (-2i) - 2i / 5 = -4i / 5 = -0.8 m/s^2 but the answer is 0.8m/s^2.

 

[jbriggs444]

I see two illegible drawings (pure black) and something in the middle with some semi-legible chicken scratchings.

 

[lomidrevo]

I think you should re-state the problem and provide readable drawing, it is not clear to me. Hint: velocity is a vector, giving value like "2 m/s" is not sufficient.

 

[HCverma]

Homework Statement

In circular motion what will be the change in velocity if initial velocity and final velocity is 2 m/s? From the left, in the 3rd diagram, if initial velocity and final velocity is 2 m/ s then what is the change in velocity? t = 5 s

Homework Equations

The Attempt at a Solution

the answer should be.
Acceleration = Vf - Vi / t = (-2i) - 2i / 5 = -4i / 5 = -0.8 m/s^2 but the answer is 0.8m/s^2.

I have edited the image so that you can understand. Please see the image and let me know.

 

[jbriggs444]

In circular motion what will be the change in velocity if initial velocity and final velocity is 2 m/s?

the answer should be.
Acceleration = Vf - Vi / t = (-2i) - 2i / 5 = -4i / 5 = -0.8 m/s^2 but the answer is 0.8m/s^2.

The question asks for a change in velocity but the answer is an acceleration? That's wrong.

 

[e-pie]

(-2i) - 2i

How can both velocity vectors have same unit vector?

According to your drawing the first one, one is along j and another along i.

The pictures are still not clear. What are you using?

 

[HCverma]

The question asks for a change in velocity but the answer is an acceleration? That's wrong.

Yes, my question is that in the picture change in velocity is 4 or -4, As I know the change in velocity is Vf -Vi = (-2i) - 2i = -4i. please see the picture.

 

[HCverma]

How can both velocity vectors have same unit vector?

According to your drawing the first one, one is along j and another along i.

The pictures are still not clear. What are you using?

Could you suggest an online editor where I could sharpen my image as much clear as I can?

 

[jbriggs444]

Yes, my question is that in the picture change in velocity is 4 or -4, As I know the change in velocity is Vf -Vi = (-2i) - 2i = -4i. please see the picture.

I would say that the change in velocity is neither 4 nor -4. It is -4i.

 

[HCverma]

I would say that the change in velocity is neither 4 nor -4. It is -4i.

would you please let me know whether you could understand my edited image I provided so that in future I would edit my images to that degree. Is it readable?

 

[jbriggs444]

would you please let me know whether you could understand my edited image I provided so that in future I would edit my images to that degree. Is it readable?

It is not pretty, but it is magnified enough that I can read it.

 

[HCverma]

It is not pretty, but it is magnified enough that I can read it.

Ok, Thanks a lot for your kind reply.

 

[haruspex]

I would say that the change in velocity is neither 4 nor -4. It is -4i.

It is not clear to me whether the use of complex variables to represent the vectors comes from the original problem or has been introduced by the student.
@HCverma , please state the problem as given to you, word for word.

 

[HCverma]

It is not clear to me whether the use of complex variables to represent the vectors comes from the original problem or has been introduced by the student.
@HCverma , please state the problem as given to you, word for word.

Next time I will.

 

[haruspex]

Next time I will.

Why not this time? As I understand it, you still lack an explanation for the book answer.