Question

Теле свободно падает с высоты 245м. сколько времени оно будет падать и с какой скоростью упадет на землю?

Answer 1

V(начальная)=0
п=10 м/с^2
h=v(начальное)t+(gt^2)/2
245=5t^2
t=7с
v(конечная)=v(начальная)+gt
v(конечная)=10*7=70м/с
Ответ: 7с, 70 м/с

Answer 2

Calculation of Time and Velocity of Free Fall

To calculate the time and velocity of an object in free fall, we can use the equations of motion. In this case, the object is falling freely from a height of 245m.

The equation for the time of free fall is given by:

t = sqrt((2h)/g)

Where: - t is the time of free fall - h is the height from which the object is falling - g is the acceleration due to gravity (approximately 9.8 m/s^2)

Let's calculate the time of free fall using this equation:

t = sqrt((2 * 245) / 9.8) = sqrt(490 / 9.8) = sqrt(50) = 7.07 seconds

Therefore, the object will take approximately 7.07 seconds to fall freely from a height of 245m.

The equation for the velocity of free fall is given by:

v = g * t

Where: - v is the velocity of free fall - g is the acceleration due to gravity (approximately 9.8 m/s^2) - t is the time of free fall

Let's calculate the velocity of free fall using this equation:

v = 9.8 * 7.07 = 69.17 m/s

Therefore, the object will reach a velocity of approximately 69.17 m/s when it hits the ground.

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