Homework Help Overview
The problem involves calculating the change in momentum of a pool ball with a mass of 120g, which hits a wall at a speed of 9m/s and rebounds at 6m/s at a 45-degree angle. The original poster expresses uncertainty about their calculations and the resulting impulse value.
Discussion Character
- Exploratory, Assumption checking, Conceptual clarification
Approaches and Questions Raised
- Participants discuss breaking down the velocities into orthogonal components and the implications of directionality in momentum calculations. Questions arise about which velocity component to consider for the impulse calculation and how to handle the signs of the velocities.
Discussion Status
Some participants provide guidance on the approach to calculating change in momentum, suggesting methods for vector addition and clarification on the treatment of negative values. There is an ongoing exploration of the correct application of these concepts without a clear consensus on the original poster's calculations.
Contextual Notes
The original poster has provided a diagram to illustrate their calculations, but there is mention of potential missing details regarding the direction of the impulse and the need to multiply by mass, which may affect the final outcome.
, except that you've not yet multiplied by the mass 
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