Mathematical and Physical Journal
for High Schools
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# Problem P. 3917. (October 2006)

P. 3917. A tram, filled with stones, moves along a on a horizontal straight track. Its total mass with the stones is M. How much work is done while a stone of mass m is thrown out of the tram with a horizontal speed of v with respect to the tram if it is thrown backwards or if it is thrown forward. Find the kinetic energy of the stone in both cases.

(5 pont)

Deadline expired on November 13, 2006.

### Statistics:

 87 students sent a solution. 5 points: Almási 270 Gábor András, Blastik Zsófia, Boros Csanád Örs, Danka Miklós András, Deli Gábor, Fialowski Melinda, Gresits Iván, Hasznos László, Hlatky Dávid, Horváth Bence, Hujter Bálint, Kovács 513 Máté, Petrás András, Till Zoltán, Tüzes Dániel, Varga Bonbien. 4 points: Antal 888 Zoltán, Balogh Máté, Blázsik Zoltán, Budafoki Richárd Gergely, Buzás Kristóf, Csató Bertalan, Fekete Zsolt, Fülöp Bálint, Kajos Henriett, Karsa Anita, Kupcsik Réka, Lovas Lia Izabella, Nagy 224 Csaba, Nagy 897 Zsolt, Nagy Loránd, Németh Dorián, Pálovics Róbert, Pósa László, Reiter Viktor, Sándor Bulcsú, Szabó 001 Áron, Szilágyi Zsombor, Szolnoki Lénárd, Szőke Nóra, Vőfély Róza, Werner Miklós. 3 points: 18 students. 2 points: 12 students. 1 point: 4 students. 0 point: 5 students. Unfair, not evaluated: 6 solutions.

Problems in Physics of KöMaL, October 2006