Mathematical and Physical Journal
for High Schools
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# Problem P. 4739. (May 2015)

P. 4739. A red and a green stone fall freely next to each other along vertical paths at a place of the universe where the acceleration due to gravity is exactly 10 m/s$\displaystyle {}^2$ and where nothing prevents free fall. The red stone just starts falling when the green stone reaches it. The green stone also started from rest but from a higher position. After a while the distance between the two stones is 7 m, and then after two more seconds elapses the distance between them will increase to 27 m. How much higher did the green stone start?

(4 pont)

Deadline expired on June 10, 2015.

### Statistics:

 60 students sent a solution. 4 points: Ardai István Tamás, Balogh Menyhért, Bartók Imre, Bekes Nándor, Berta Dénes, Blum Balázs, Boldizsár Bálint, Bugár 123 Dávid, Csathó Botond, Csire Roland, Csorba Benjámin, Eper Miklós, Fehér Balázs, Fekete Balázs Attila, Fekete Panna, Forrai Botond, Holczer András, Horváth Péter, Iván Balázs, Kaposvári Péter, Kopitkó Tünde, Kovács 526 Tamás, Mándoki László, Marozsák Tóbiás , Molnár 128 Szilárd, Molnár 157 Marcell, Molnár Elizabet, Németh Flóra Boróka, Olosz Balázs, Öreg Botond, Páhoki Tamás, Pázmán Előd, Pszota Máté, Radnai Bálint, Sallai Krisztina, Simon Dániel Gábor, Szántó Benedek, Szentivánszki Soma , Szépfalvi Bálint, Tanner Martin, Tibay Álmos, Tófalusi Ádám, Tóth Ádám Bars, Valus Dávid, Varga-Umbrich Eszter, Vastag Balázs, Wesniczky Albert, Wiandt Péter, Zöllner András. 3 points: 7 students. 2 points: 3 students. 1 point: 1 student.

Problems in Physics of KöMaL, May 2015