Calculating Change in Kinetic Energy for 1D Collision

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Homework Help Overview

The problem involves a one-dimensional collision between two objects with different masses and velocities, specifically focusing on the change in kinetic energy of one of the objects post-collision. The subject area is primarily physics, dealing with concepts of momentum and kinetic energy in collisions.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the method for calculating the final velocities after the collision and how to determine the change in kinetic energy for the 4 kg object. There is a focus on the correct application of equations related to elastic collisions.

Discussion Status

The discussion is ongoing, with participants clarifying the type of collision (elastic vs. inelastic) and questioning the appropriate equations to use. Some guidance has been offered regarding the calculation of kinetic energy, but there is no consensus on the correct approach yet.

Contextual Notes

There is confusion regarding the classification of the collision as elastic or inelastic, which affects the equations that should be applied. Participants are also navigating the implications of their assumptions based on the problem statement.

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Homework Statement



A 2kg object moving 5m/s in the positive x direction has a one dimensional elastic collision with a 4kg object moving at 1m/s in the same direction. What is the resulting change in kinetic energy of the 4 kg object?

Homework Equations


K=1/2 m*v^2 m1v1+m2v2=(m1+m2)V


The Attempt at a Solution


after solving for V would i just plug that into the kinetic energy and subtract it from the original kinetic energy of the 4kg object?
 
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If you find V correctly then yes, you can just find the new kinetic energy of the 4 kg object and calculate the difference.'

EDIT: Although I wouldn't trust your stated equation for finding the new velocity. If you look at your original post, the words "elastic collision" have been underlined. Try following that link, it should have the relevant equation.
 
o wow i read that wrong.
 
so i would use m1v1+M2V2=M1V1'+M2V2' but i do not know either of the final velocities?
 
OK, I need to know: Your thread title says "inelastic collision" but your 1st post says "elastic collision." Which is it?
 

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