Mathematical and Physical Journal
for High Schools
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# Problem P. 4488. (December 2012)

P. 4488. The following safe distances between two cars are suggested in order to avoid rear-end collisions: for a speed of 70 km/h the safe distance is 20 m, for a speed of 100 km/h the safe distance is 30 m, for a speed of 130 km/h the safe distance is 40 m. What is your opinion about these suggestions?

(4 pont)

Deadline expired on January 10, 2013.

Sorry, the solution is available only in Hungarian. Google translation

Megoldásvázlat. A követési távolság legalább akkora kell legyen, mint a haladási sebesség és a reakcióidő szorzata. A megadott számoknál ez teljesül, ha a reakcióidő kb. 1 másodperc.

### Statistics:

 154 students sent a solution. 4 points: 53 students. 3 points: 4 students. 2 points: 4 students. 1 point: 5 students. 0 point: 86 students. Unfair, not evaluated: 2 solutions.

Problems in Physics of KöMaL, December 2012