Mathematical and Physical Journal
for High Schools
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Problem P. 4371. (October 2011)

P. 4371. A pebble shot by a slingshot has an initial vertical, upward speed of 50 m/s. If there was no air drag

a) where would the pebble be after 7 seconds;

b) What would its speed be at that moment;

c) How much distance would it cover in 7 seconds?

(3 pont)

Deadline expired on November 10, 2011.


Sorry, the solution is available only in Hungarian. Google translation

Megoldás. \(\displaystyle a)\) 109,3 m magasan lenne;

\(\displaystyle b)\) 18,7 m/s sebességgel esne lefelé.

\(\displaystyle c)\) Kb. 127 métert emelkedne és 18 métert esne a kavics, tehát összesen 145 m utat tenne meg 7 s alatt.


Statistics:

388 students sent a solution.
3 points:301 students.
2 points:44 students.
1 point:25 students.
0 point:11 students.
Unfair, not evaluated:7 solutions.

Problems in Physics of KöMaL, October 2011