Mathematical and Physical Journal
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Problem P. 4845. (May 2016)

P. 4845. There is an object of mass \(\displaystyle m_2=1\) kg at rest on the top of a cart of mass \(\displaystyle m_1=2\) kg. Between the object and the wall of the cart at its back there is a spring kept tight with a piece of thread as shown in the figure. After burning the thread the spring pushes the 1 kg object off the cart at a speed of 6 m/s with respect to the ground.

How much elastic potential energy was stored in the spring? (Friction is negligible.)

(3 pont)

Deadline expired on June 10, 2016.


Statistics:

56 students sent a solution.
3 points:Ardai István Tamás, Berke Martin, Boros Máté, Bukor Benedek, Cseh Noémi, Debreczeni Tibor, Elek Péter, Fajszi Bulcsú, Fehér 169 Szilveszter, Fekete Balázs Attila, Gál Péter Levente, Hajnal Dániel Konrád, Iván Balázs, Kárpáti Márton, Kluèka Vivien, Kormányos Hanna Rebeka, Kovács 526 Tamás, Körmöczi Dávid, Krasznai Anna, Magyar Róbert Attila, Makovsky Mihály, Mány Bence, Merkl Gergely, Molnár Mátyás, Nagy 284 Domonkos, Nagy 555 Botond, Németh Csaba Tibor, Nyerges Dóra, Páhoki Tamás, Paulovics Péter, Pázmán Előd, Pintér 345 Balázs, Sallai Krisztina, Simon Dániel Gábor, Stefán Boglárka Abigél, Sugár Soma, Szántó Benedek, Szigeti Zsófia, Szőke Dániel, Tanner Martin, Tibay Álmos, Tófalusi Ádám, Tóth 111 Máté , Tóth Bence, Varga-Umbrich Eszter, Wesniczky Albert, Zöllner András.
2 points:Édes Lili, Keltai Dóra, Zeke Norbert.
1 point:5 students.
0 point:1 student.

Problems in Physics of KöMaL, May 2016