Question

Тело совершает свободное падение с некоторой высоты и достигает поверхности Земли через 4с. Определите скорость тела в момент удара о Землю.

Answer 1

V = gt
v = 10 * 4 = 40 m \ c

Answer 2

Calculation of the Velocity of an Object in Free Fall

To determine the velocity of an object at the moment of impact with the Earth's surface after free-falling from a certain height, we can use the equation of motion for free fall:

v = gt

where: - v is the final velocity of the object - g is the acceleration due to gravity (approximately 9.8 m/s^2 on Earth) - t is the time taken for the object to fall

In this case, the object takes 4 seconds to reach the Earth's surface. Therefore, we can substitute the values into the equation:

v = (9.8 m/s^2) * (4 s) = 39.2 m/s

Therefore, the velocity of the object at the moment of impact with the Earth's surface is 39.2 m/s.

Please note that this calculation assumes no air resistance and that the object is falling near the surface of the Earth.