Mathematical and Physical Journal
for High Schools
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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 June 10, 2011.

Sorry, the solution is available only in Hungarian. Google translation

Megoldás. Az érkező golyó sebessége 16 m/s.


113 students sent a solution.
4 points:77 students.
3 points:30 students.
2 points:2 students.
1 point:1 student.
0 point:1 student.
Unfair, not evaluated:2 solutionss.

Problems in Physics of KöMaL, May 2011