Elastic collision 2 dimension unequal masses not at rest

AI Thread Summary
The discussion focuses on solving a two-dimensional elastic collision problem involving a blue ball (1.5 kg, 4.5 m/s) and a red ball (3.6 kg, 2.7 m/s). Participants suggest using Galilean transformation to simplify the problem by making one ball stationary, allowing the application of one-dimensional collision formulas. The conservation of momentum is emphasized as a key principle that applies in both the x- and y-directions during the collision. The goal is to determine the final velocities (magnitude and direction) of both balls post-collision. Understanding these concepts is crucial for solving two-dimensional elastic collision problems effectively.
grrrphysics
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Please help! i know how to do a elastic collisions in 1 dimension, but the 2D is too confusing...here is my problem:

You have a blue ball with a mass of 1.5 kg moving with a speed of 4.5 m/s in a direction below the positive x-axis. You have a red ball with a mass of 3.6 kg moving with a speed of 2.7 m/s in a direction to the left of the negative y-axis. When the balls collide, find the final velocity (magnitude and direction) for each of the two balls.
 
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grrrphysics said:
Please help! i know how to do a elastic collisions in 1 dimension, but the 2D is too confusing...here is my problem:

You have a blue ball with a mass of 1.5 kg moving with a speed of 4.5 m/s in a direction below the positive x-axis. You have a red ball with a mass of 3.6 kg moving with a speed of 2.7 m/s in a direction to the left of the negative y-axis. When the balls collide, find the final velocity (magnitude and direction) for each of the two balls.

simple way to solve this is by using galilean transformation equations and turn one of the balls into a stationary one and just use the 1D formulas
 
grrrphysics said:
Please help! i know how to do a elastic collisions in 1 dimension, but the 2D is too confusing...here is my problem:

You have a blue ball with a mass of 1.5 kg moving with a speed of 4.5 m/s in a direction below the positive x-axis. You have a red ball with a mass of 3.6 kg moving with a speed of 2.7 m/s in a direction to the left of the negative y-axis. When the balls collide, find the final velocity (magnitude and direction) for each of the two balls.

Conservation of momentum holds in both the x- and y-directions.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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