Problem P. 4125. (January 2009)

P. 4125. It is often seen in crossroads where there is a traffic light that when the light shows green the front of a starting car rises up a bit. And also when the light goes red the back of a stopping car rises a bit. What is the explanation for these phenomena?

(3 pont)

Deadline expired on February 11, 2009.

Statistics:

91 students sent a solution.
3 points:	Boros Csanád Örs, Czinder Gábor, Farkas Martin, Fridrich Veronika, Hegedűs Csaba, Jankovics Éva, Ji Hai Ou, Laczkó Zoltán Balázs, Pinczei Emese, Túri Patrik, Zsámboki Richárd.
2 points:	Bósza Gergő, Franko Mátyás Krisztián, Fricska Zoltán, Galzó Ákos Ferenc, Izsóf Máté, Janosov Milán, Kiss Boldizsár, Kovács 646 Soma, Kovács Attila, Neumer Tamás, Pásztor Ákos, Sass Zoltán, Szabó 126 Gergely, Vécsi Áron.
1 point:	51 students.
0 point:	10 students.
Unfair, not evaluated:	5 solutionss.

Problems in Physics of KöMaL, January 2009