KöMaL - Mathematical and Physical Journal for Secondary Schools
Hungarian version Information Contest Journal Articles News
Entry form to the contest
Problems and solutions
Results of the competition
Problems of the previous years



Order KöMaL!

Competitions Portal

P. 4003. On a running training the runners run at a speed of v=5 m/s along a straight path, forming an L=35 m long column. Their coach runs towards them at a speed of u=2 m/s. The first runner turns back and runs in the same direction as the coach, still at a speed of v, when he meets the coach, and so do all the runners when they meet their coach.

a) How much time elapses between the turn of the first and the last runner?

b) How long is the column when they all run in the same direction as the coach?

(4 points)

Deadline expired on 12 November 2007.

Statistics on problem P. 4003.
367 students sent a solution.
4 points:229 students.
3 points:15 students.
2 points:108 students.
1 point:7 students.
0 point:2 students.
Unfair, not evaluated:5 solutions.
Unfair, not evaluated:1 solution.

  • Problems in Physics of KöMaL, October 2007

  • Our web pages are supported by:   Ericsson   Google   Cognex   Emberi ErőforrĂĄs TĂĄmogatĂĄskezelő   Emberi ErőforrĂĄsok MinisztĂŠriuma  
    OktatĂĄskutatĂł ĂŠs Fejlesztő IntĂŠzet   Nemzeti TehetsĂŠg Program     Nemzeti
KulturĂĄlis Alap   ELTE   Morgan Stanley