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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 points)

Deadline expired on 11 October 2006.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldás. a) F=216 N.

b) 1,1 kW.

Statistics on problem P. 3906.
 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

•  Támogatóink: Morgan Stanley