Question

Тело свободно падало с высоты 45м определите время падения

Answer 1

V0 = 0
g = 10м/с^2
h = 45м
s = V0 + (a*t^2)/2
s = -(g*t^2)/2
2s/g = t^2
t = [корень(2s/g)] = [корень(2*45/10)] = [корень(9)] = 3c
Ответ: 3с.

Answer 2

Calculation of Time of Free Fall

To calculate the time it takes for an object to fall freely from a height of 45m, we can use the equation for free fall:

h = (1/2)gt^2

Where: - h is the height (45m in this case) - g is the acceleration due to gravity (approximately 9.8 m/s^2 on Earth) - t is the time of free fall

To find the time, we can rearrange the equation:

t = sqrt(2h/g)

Substituting the given values:

t = sqrt(2 * 45 / 9.8)

Now let's calculate the time using this equation.

Calculation:

Using the equation t = sqrt(2 * 45 / 9.8), we can calculate the time it takes for the object to fall freely from a height of 45m.

t = sqrt(90 / 9.8) ≈ sqrt(9.18) ≈ 3.03 seconds

Therefore, the time it takes for the object to fall freely from a height of 45m is approximately 3.03 seconds.

Please note that this calculation assumes no air resistance and that the object is dropped from rest at the given height.