Mathematical and Physical Journal
for High Schools
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Problem P. 4850. (May 2016)

P. 4850. The mass of a small ball is 5 g, and its diameter is 4 cm. The ball is hit upward at a speed of \(\displaystyle 10~\frac{\rm m}{\rm s}\) in the air which has a temperature of \(\displaystyle 20~{}^\circ\)C and a pressure of 1 bar. Calculate with approximations the followings:

\(\displaystyle a)\) the height to which the ball ascends;

\(\displaystyle b)\) the time during which the ball arrives back to its initial position;

\(\displaystyle c)\) the speed of the ball when it gets back to its initial position.

(6 pont)

Deadline expired on June 10, 2016.


18 students sent a solution.
6 points:Asztalos Bogdán, Balogh Menyhért, Blum Balázs, Di Giovanni András, Elek Péter, Fehér 169 Szilveszter, Forrai Botond, Iván Balázs, Kasza Bence, Kovács Péter Tamás, Körmöczi Dávid, Marozsák Tóbiás , Olosz Adél, Sal Kristóf.
5 points:Páhoki Tamás, Szentivánszki Soma .
4 points:1 student.
2 points:1 student.

Problems in Physics of KöMaL, May 2016