Question

Тело падает с на землю с высоты 80 м. найти его время падения и скорость тела во время удара о землю. помогите плз проверочная

Answer 1

Осмелюсь предположить.
$t = \sqrt \frac{2S}{g} = \sqrt \frac{2*80}{9.8} = 4$ сек
V = $V_{0}$ + gt = 9,8*4 ≈ 40м\с

Answer 2

Calculating Time of Fall and Impact Velocity

To find the time of fall and the velocity of an object falling from a height of 80 meters, we can use the equations of motion. The equations of motion for an object in free fall are:

1. Time of Fall (t): The time of fall can be calculated using the equation: \[ t = \sqrt{\frac{2h}{g}} \] where \( h = 80 \, \text{m} \) (height) and \( g = 9.81 \, \text{m/s}^2 \) (acceleration due to gravity).

Substituting the given values: \[ t = \sqrt{\frac{2 \times 80}{9.81}} \]

Calculating the value of \( t \) gives us the time of fall.

2. Velocity at Impact (v): The velocity of the object just before impact can be calculated using the equation: \[ v = gt \] where \( g = 9.81 \, \text{m/s}^2 \) (acceleration due to gravity) and \( t \) is the time of fall calculated previously.

Substituting the value of \( t \) into the equation gives us the velocity at impact.

Let's calculate these values.