Question

Тело брошенно вниз с высоты 15 м. Найти время падения, скорость перед ударом о землю. (Vo=o)

Answer 1

S=15 м
S= at^2/2
a=g=10 м/с

t = (2S/a)^0,5
t = (30/10)^0,5 = 3^0,5 = 1,7 с

Answer 2

Calculation of Time of Fall and Impact Velocity

To calculate the time of fall and impact velocity of an object dropped from a height of 15 m, we can use the equations of motion and the principles of free fall.

The equation for the time of fall is given by:

t = sqrt(2h/g)

where: - t is the time of fall - h is the height from which the object is dropped (in this case, 15 m) - g is the acceleration due to gravity (approximately 9.8 m/s^2)

Substituting the given values into the equation, we can calculate the time of fall:

t = sqrt(2 * 15 / 9.8) = 1.92 seconds.

The equation for the impact velocity is given by:

v = gt

where: - v is the impact velocity - g is the acceleration due to gravity (approximately 9.8 m/s^2) - t is the time of fall (calculated as 1.92 seconds)

Substituting the values into the equation, we can calculate the impact velocity:

v = 9.8 * 1.92 = 18.82 m/s.

Therefore, the time of fall is approximately 1.92 seconds, and the impact velocity is approximately 18.82 m/s.

Please note that these calculations assume no air resistance and a constant acceleration due to gravity.