Problem P. 4350. (May 2011)
P. 4350. A ball collides with another, stationary ball. The collision is head on and elastic. The change in the velocity of the moving ball is 20 m/s. The ratio of the masses of the moving and the stationary ball is 3:5. What was the initial speed of the moving ball?
(4 pont)
Deadline expired on 10 June 2011.
Sorry, the solution is available only in Hungarian. Google translation
Megoldás. Az érkező golyó sebessége 16 m/s.
Statistics:
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4 points:  77 students. 
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1 point:  1 student. 
0 point:  1 student. 
Unfair, not evaluated:  2 solutions. 
