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Must Waste More Time...
1) h =13m; 2) t =1+ √1,3+
Объяснение:
h = 18t - 5t²
вначале при полете вверх на камень действует сила тяжести, которая снижает его скорость до полной остановки, а затем он под действием силы тяжести вернется обратно на землю.
1) определим в какой момент времени камень брошенный вверх потеряет скорость (v=0)
v = v0 - gt ; v0-gt = 0
t = v0/g время подъема, t = 10/10 =1 c.
а теперь рассчитаем высоту на которую он поднимется
h = 18v0/g - 5(v0/g)² (для удобства расчета примем g=10)
h = 18*10/10 - 5(10/10)² =18 - 5 =13
h =13 m t = 1 время подъема
2)теперь определим время возврата мяча на землю под действием силы тяжести.
h = v0t + gt²; где v0=0 начальная скорость. g =10
h = gt²
t² = h/g
полное время полета с момента запуска
t = t1 + t2 = 1 + √1.3