Mathematical and Physical Journal
for High Schools
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Problem P. 3906. (September 2006)

P. 3906. A 2-kg brick falls 5 m and then a worker catches it and brings it into rest in a distance of 0.5 m exerting an upward constant force. a) Find the force exerted by the worker. b) Find the average power of the worker.

(4 pont)

Deadline expired on October 11, 2006.


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

Megoldás. a) F=216 N.

b) 1,1 kW.


Statistics:

376 students sent a solution.
4 points:163 students.
3 points:22 students.
2 points:121 students.
1 point:40 students.
0 point:14 students.
Unfair, not evaluated:16 solutions.

Problems in Physics of KöMaL, September 2006