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P. 3995. A 2 kg lead ball and a big medicine ball of mass 2 kg are dropped from the same height. The lead ball reaches the ground in 2 seconds and the medicine ball hits the ground with a speed of 10 m/s.

Calculate the work done on the medicine ball by the air drag.

(4 points)

Statistics on problem P. 3995.
 315 students sent a solution. 9 points: Kardos Ádám. 4 points: 50 students. 3 points: 202 students. 2 points: 11 students. 1 point: 16 students. 0 point: 10 students. Unfair, not evaluated: 25 solutions.

• Problems in Physics of KöMaL, September 2007

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