00517naa#a2200169#i#450# EN\\bibl\68694 20241219193340.4 2307-7476 20160625b2016####ek#y0engy0150####ca RUS RU SOME SAFETY ISSUES IN SIMPLE MECHANICS PROBLEMS Journal article Saint-Petersburg Saint-Petersburg University of State Fire Service of Emercom of Russia 2016 12 с. Journal article local Trubilko A I journals.igps.ru