Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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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 solutionss.

Problems in Physics of KöMaL, October 2011