Question

Тело свободно падает из состояния покоя с высоты 80м. Каково его время движения.

Answer 1

H=gt^2/2
h=80м, g=10м/с^2
Отсюда находим t. Оно равно 4 секунды

Answer 2

Calculating Time of Fall from Rest

To calculate the time it takes for an object to fall freely from rest from a height of 80m, we can use the formula:

t = sqrt(2h/g)

Where: - t = time of fall - h = height (in this case, 80m) - g = acceleration due to gravity (approximately 9.81 m/s^2)

Calculation

Using the given formula, we can calculate the time of fall:

t = sqrt(2 * 80 / 9.81) t ≈ sqrt(16.26) t ≈ 4.03 seconds

So, the time it takes for the object to fall freely from rest from a height of 80m is approximately 4.03 seconds.