Problem P. 3916. (October 2006)
P. 3916. A small ball is thrown from a height of 1 m, and 2 m away from a vertical wall. The ball bounces on the ground and on the vertical wall totally elastically and then it flies back to its initial position of throwing. Find the initial speed of the ball if it was thrown at an angle of 45o with the horizontal. (Air drag can be neglected).
Deadline expired on November 13, 2006.
120 students sent a solution. 5 points: Balogh Máté, Csató Bertalan, Danka Miklós András, Karsa Anita, Nyíri Dávid Ákos, Szilágyi Zsombor, Szőke Nóra, Tüzes Dániel, Varga Bonbien, Werner Miklós. 4 points: 48 students. 3 points: 17 students. 2 points: 19 students. 1 point: 21 students. 0 point: 2 students. Unfair, not evaluated: 3 solutions.