Question

С какой скоростью тело упадет с высоты 30 м, если трением пренибречь?

Answer 1

Mgh=mv^2/2
v=корень из 2gh

Answer 2

Calculating the Speed of an Object Falling from a Height

To calculate the speed at which an object falls from a height of 30 meters, we can use the formula for the final velocity of an object in free fall, neglecting air resistance. The formula is:

v = √(2gh)

Where: - v = final velocity - g = acceleration due to gravity (approximately 9.81 m/s² near the surface of the Earth) - h = height from which the object falls

Calculation

Using the given height of 30 meters and the acceleration due to gravity of 9.81 m/s², we can calculate the final velocity using the formula:

v = √(2 * 9.81 * 30)

Result

By plugging in the values and solving the equation, we find that the speed at which the object falls from a height of 30 meters, neglecting friction, is approximately 21.9 m/s.

This information is based on the physics formula for the final velocity of an object in free fall, neglecting air resistance