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P. 4280. On object is projected horizontally from a tower and it hits the ground 40 m from the foot of the tower at an angle of 45o. (Air-drag is negligible.) a) From what height is the object projected? b) From what height should the object be projected with the same initial horizontal speed, in order that the ratio of the horizontal and vertical displacements of the object should be the reciprocal of those of the former ones?

(4 points)

Deadline expired on 10 November 2010.

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

Megoldás. A test 20 m magasról indult, 20 m/s kezdősebességgel.

Ha egy 320 m magas toronyból indulna ugyanakkora sebességel, akkor 8 s alatt érne földet, a torony aljától 160 m távolságra.

Statistics on problem P. 4280.
302 students sent a solution.
4 points:245 students.
3 points:14 students.
2 points:26 students.
1 point:1 student.
0 point:9 students.
Unfair, not evaluated:7 solutions.

  • Problems in Physics of KöMaL, October 2010

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