Momentum and Impulse. find final velocity

Click For Summary
SUMMARY

The discussion centers on calculating the final velocity of a 0.10-kg object after an elastic collision with a 0.15-kg object at rest. The correct approach involves using the conservation of momentum and energy principles, specifically the equation m1v1i + m2v2i = m1v1f + m2v2f. The final velocity of the 0.10-kg object is determined to be -0.045 m/s, indicating a change in direction post-collision.

PREREQUISITES
  • Understanding of elastic collisions in physics
  • Familiarity with conservation of momentum
  • Knowledge of conservation of energy principles
  • Basic algebra for solving equations
NEXT STEPS
  • Study the principles of elastic and inelastic collisions
  • Learn how to apply conservation of momentum in multi-object systems
  • Explore the derivation of the final velocity equations for elastic collisions
  • Practice problems involving conservation of energy in collisions
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and collision theory, as well as educators looking for examples of elastic collision problems.

maxjohnfresh
Messages
1
Reaction score
0

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 ?


Homework Equations



im not sure which equation to use :/

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
 
Physics news on Phys.org
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.
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
929
  • · Replies 19 ·
Replies
19
Views
3K
Replies
57
Views
3K
  • · Replies 13 ·
Replies
13
Views
1K
  • · Replies 14 ·
Replies
14
Views
2K
  • · Replies 10 ·
Replies
10
Views
3K
Replies
5
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
8
Views
12K
  • · Replies 1 ·
Replies
1
Views
2K