Mathematical and Physical Journal
for High Schools
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Problem P. 4486. (December 2012)

P. 4486. Sam was courious to find the speed of the elevator in their house. For his measurement he used a bathroom scale and a stopwatch. He got into the lift at the groundfloor, stood on the the scale and recorded the readings on the scale. The reading was 50 kg when the elevator was at rest, and for 2 seconds right after the lift started to move the reading of the scale was 52 kg. What is the speed of the elevator when it moves uniformly?

(3 pont)

Deadline expired on January 10, 2013.


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

Megoldásvázlat. \(\displaystyle 0{,}78~{\rm m/s}\approx 0{,}8~{\rm m/s}.\)


Statistics:

189 students sent a solution.
3 points:129 students.
2 points:45 students.
1 point:13 students.
0 point:1 student.
Unfair, not evaluated:1 solution.

Problems in Physics of KöMaL, December 2012