во времня подъема в гору скорость велосипедиста, двигающегося прямолинейно и равноускоренно, изменилась за 8 с от 18км/ч до 10.8км/ч. При этом ускорение велосипедиста было равно
in vremnâ the Hill speed biker, moving in a straight line and ravnouskorenno, changed over to 8 from 18 km/h up to 6.7 km/h while acceleration of the cyclist is
in vremni lifting uphill speed biker, moving in a straight line and uniformly accelerated, changed from 8 to 18 km / h to 10.8km / h. Thus the acceleration is equal cyclist
in времня recovery in mountain bicyclist moving direct speed, and равноускоренно changed for 8 from the 18км / h to 10.8км / h. with the acceleration of the cyclist was still