Velocities of balls after 2D collision

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Homework Help Overview

The discussion revolves around a two-dimensional collision involving three balls, where one ball strikes two stationary balls and is repelled at a specific velocity and angle. The problem involves understanding the velocities of the balls post-collision and the application of conservation of momentum principles.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the need for additional information, such as the masses of the balls, and explore how to apply conservation of momentum in the context of angles involved in the collision.

Discussion Status

Some participants have provided guidance on using conservation of momentum and suggested treating the x and y components of momentum separately. However, there remains uncertainty regarding the incorporation of angles into the calculations.

Contextual Notes

Participants note that the masses of the balls are constant at 2kg, which may influence the momentum calculations. There is an ongoing exploration of how to handle the angles in the momentum equations.

UrbanXrisis
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If a ball at 5m/s struck two stationary balls and it is repelled back at -3m/s at an angle of 15 degrees, what would be the velocity of ball #2 if ball #1 traveled at 1m/s and 10 degrees from the normal?
 
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Need more information. Masses of the balls?

cookiemonster
 
The masses of the balls are constant at 2kg
 
Use conservation of momentum for C.M
 
but how do I take the angles into account?
 
components

UrbanXrisis said:
but how do I take the angles into account?
Treat x and y components of momentum separately. (Call the original direction the x-axis.)
 

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