Question

Камень падает без начальной скорости с высоты 80 м.Определите его скорость в момент достижения поверхности земли? помогите пожалуйста?????))))))

Answer 1

Формула:
V = √(2*g*H) =√(2*10*80)=√1600 = 40 м/с

Answer 2

Calculation of the velocity of a falling object

To determine the velocity of an object falling from a height of 80 meters without any initial velocity, we can use the equations of motion. The equation that relates the final velocity (Vf), initial velocity (Vi), acceleration (a), and displacement (d) is:

Vf^2 = Vi^2 + 2ad

In this case, the initial velocity (Vi) is 0 m/s, the acceleration (a) is the acceleration due to gravity (approximately 9.8 m/s^2), and the displacement (d) is -80 meters (negative because the object is falling downwards).

Substituting the given values into the equation, we can solve for the final velocity (Vf):

Vf^2 = 0^2 + 2 * 9.8 * (-80)

Vf^2 = 0 + (-1568)

Vf^2 = -1568

Taking the square root of both sides, we get:

Vf = √(-1568)

However, the square root of a negative number is not a real number, so we cannot directly calculate the final velocity using this equation. This indicates that the object will not reach the surface of the Earth with a positive velocity.

Therefore, we can conclude that the object will reach the surface of the Earth with a velocity of 0 m/s.