Предмет: Физика, автор: inka382

ПОМОГИТЕ ПОЖАЛУЙСТА!!!

Тело движется параллельно оси X. Изменение его скорости определяется заданным уравнением движения.


Vx=-20+5t


Вычислите скорость тела через 5с. напишите уравнение для координаты тела, если исходная координата
x0 = 20 м. вычислите координату тела, смещение и пройденный путь через 5 секунд.

Ответы

Автор ответа: hitman2911
0

Объяснение:

Чтобы вычислить скорость тела через 5 секунд, можно подставить значение t в уравнение Vx = -20 + 5t:

Вх = -20 + 5(5)

Вх = -20 + 25

Vx = 5 м/с

Уравнение координаты тела можно получить, проинтегрировав данное уравнение движения:

x = ∫(Vx)dt = ∫(-20 + 5t)dt

Интегрируя, получаем:

х = -20т + (5т^2)/2 + С

Чтобы найти константу интегрирования (С), можно подставить начальную координату x0 = 20 м:

20 = -20(0) + (5(0)^2)/2 + С

20 = С

Таким образом, уравнение координаты тела имеет вид:

х = -20t + (5t^2)/2 + 20

Теперь рассчитаем координату тела, его перемещение и расстояние, пройденное за 5 секунд:

- Координата (х):

х = -20(5) + (5(5)^2)/2 + 20

х = -100 + 125/2 + 20

х = -100 + 62,5 + 20

х = -17,5 м

- Водоизмещение:

Смещение — это изменение положения, определяемое разницей между конечной и начальной координатами:

Смещение = x - x0

Водоизмещение = -17,5 - 20

Водоизмещение = -37,5 м

- Пройденный путь:

Пройденное расстояние является абсолютной величиной перемещения:

Расстояние = |Смещение|

Расстояние = |-37,5|

Расстояние = 37,5 м

Следовательно, через 5 секунд скорость тела равна 5 м/с, его координата -17,5 м, перемещение -37,5 м, пройденный путь - 37,5 м.

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