Mathematical and Physical Journal
for High Schools
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Problem P. 3995. (September 2007)

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 pont)

Deadline expired on October 11, 2007.


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 solutionss.

Problems in Physics of KöMaL, September 2007