• Support PF! Buy your school textbooks, materials and every day products via PF Here!

Instantaneous Velocity with Position v. Time graph

1. Homework Statement
The position v. time graph for a certain object moving along the x-axis is shown.

I don't have the graph. Bu I have the points.

(0,-2), (1,9), (4,4), (6,4), (8,-4), (9,0)


The object's initial position is -2m. Find the instantaneous velocity at .... (m/s)
a.) 0.5s
b.) 2.5s
c.) 5 s
d.) 8.5 s


2. Homework Equations

I think ....

Instantaneous Velocity = (Xf - Xi) / (Tf - Ti)


3. The Attempt at a Solution

Well, I really don't understand where to start. Looking at the graph, for 0.5 sec ... I put 4. That was incorrect.

I put in (4-(-2)) / (0.5 - 0) = 6/0.5 = 12. That's incorrect as well.

I think I really don't understand the correct thing to do. If someone could give me some guidance or direction as how to tackle this I'd appreciate it. Thanks in advance!
 
523
0
The first thing you need to do is realize for each ordered pair (a,b) which value is position and which is time?
 

Related Threads for: Instantaneous Velocity with Position v. Time graph

Replies
2
Views
36K
Replies
4
Views
15K
Replies
6
Views
5K
Replies
5
Views
72K
Replies
2
Views
6K
Replies
5
Views
1K
Replies
2
Views
1K
Replies
1
Views
2K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top