Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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# Problem G. 645. (October 2018)

G. 645. In a NASA' vacuum chamber it was filmed that both a hammer and a feather fall towards the Earth at the same acceleration of $\displaystyle g=9.81~\rm m/s^2$, and if they are released at the same instant then they hit the ground at the same time. What will the acceleration of the feather and the hammer be if the film is played at twice the speed of the recording?

(3 pont)

Deadline expired on November 12, 2018.

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

Megoldás. Ha a valóságban – például – 5 méter magasról leejtett test 1 másodperc alatt esik le a földre, akkor a kétszeres sebességgel vetített filmen az esés ideje 0,5 másodperc lesz. Ez $\displaystyle a \approx 40~\rm m/s^2$, vagyis $\displaystyle 4g$ gyorsulású mozgásnak látszik.

### Statistics:

 100 students sent a solution. 3 points: 61 students. 2 points: 5 students. 1 point: 3 students. 0 point: 26 students. Not shown because of missing birth date or parental permission: 5 solutions.

Problems in Physics of KöMaL, October 2018