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

Momentum and Impulse. find final velocity!

1. Homework Statement
A 0.10-kg object moving initially with a velocity of 0.20 m/s eastward makes an elastic head-on collision with a 0.15-kg object initially at rest. What is the final velocity of the .10 kg object after the collision ?


2. Homework Equations

im not sure which equation to use :/

3. The Attempt at a Solution

i tried using m1v1+m2v2=(m1+m2) V
but it didnt come out right.

and i know the answer is -0.045 m/s
 

rl.bhat

Homework Helper
4,433
5
Hi maxjohnfresh, welcome to PF.
i tried using m1v1+m2v2=(m1+m2) V
This formula is true if both objects move together after collision.
So use the formula
m1v1i+m2v2i=(m1v1f+m2v2f) .
Apply the conservation of energy and solve for v1f and v2f.
 

Related Threads for: Momentum and Impulse. find final velocity!

Replies
1
Views
4K
  • Posted
Replies
3
Views
12K
Replies
11
Views
11K
Replies
6
Views
439
Replies
9
Views
2K
Replies
13
Views
2K
Replies
1
Views
2K
  • Posted
Replies
4
Views
8K

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