Question

С высоты 80 м брошен горизонтально камень со скоростью 10 м/с. Через сколько времени камень упадёт на землю?

Answer 1

80:10=8(с)-время
Ответ:камень упадёт на землю через 8 секунд

Answer 2

Problem Analysis

We are given that a stone is thrown horizontally from a height of 80 m with an initial velocity of 10 m/s. We need to find the time it takes for the stone to fall to the ground.

Solution

To solve this problem, we can use the equations of motion. Since the stone is thrown horizontally, the initial vertical velocity is 0 m/s. The only force acting on the stone is gravity, which causes it to accelerate downwards at a rate of 9.8 m/s^2.

We can use the equation of motion for vertical motion:

h = ut + (1/2)gt^2

Where: - h is the vertical displacement (in this case, the height of the stone above the ground) - u is the initial vertical velocity (0 m/s) - g is the acceleration due to gravity (9.8 m/s^2) - t is the time

Substituting the given values into the equation, we have:

80 = 0*t + (1/2)*9.8*t^2

Simplifying the equation, we get:

4.9t^2 = 80

Dividing both sides of the equation by 4.9, we have:

t^2 = 16.3265

Taking the square root of both sides, we get:

t = 4.04 seconds

Therefore, it will take approximately 4.04 seconds for the stone to fall to the ground.

Answer

The stone will take approximately 4.04 seconds to fall to the ground.