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M1 AQA momentum help!! Watch

1. How do you find the speed of a particle if you don't have any masses, likethis question;
A red snooker ball that was at rest is hit directly by a white ball moving a 0.8m/s1. After the collision the red ball moves at 0.75 m/s1. Assume that all the motion takes place on a straight line. Find the speed of the white ball after the collision.

HELPPP!
2. (Original post by LeaJ)
How do you find the speed of a particle if you don't have any masses, likethis question;
A red snooker ball that was at rest is hit directly by a white ball moving a 0.8m/s1. After the collision the red ball moves at 0.75 m/s1. Assume that all the motion takes place on a straight line. Find the speed of the white ball after the collision.

HELPPP!
Based on the information there, you would have to assume that they had the same mass (which you can call "m" and it will cancel out when you do the calculations), although it should say in the exact wording of the question.
3. I posted the question and it doesnt give a mass, according to the answer, you have to take the 0.75m/s away from the 0.80m/s

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Updated: December 8, 2010
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