Question

Тело, имеющее массой 10 г, свободно падает в течении 3 секунд, определите потенциальную энергию в начале падения.​

Answer 1

Mg=mgh
m=0,01 кг
Eп=mgh(тк тело поднято)
H=gt^2/2
=> Еп=mg*gt^2/2
Еп=4,5 Н

Answer 2

Calculation of Potential Energy

To calculate the potential energy of an object, we need to know its mass and the acceleration due to gravity. In this case, we are given that the object has a mass of 10 grams and it freely falls for 3 seconds.

The formula to calculate potential energy is:

Potential Energy = mass * acceleration due to gravity * height

The acceleration due to gravity is approximately 9.8 m/s^2.

Since the object is freely falling, we can assume that its initial velocity is zero. Therefore, the height can be calculated using the formula:

Height = (1/2) * acceleration due to gravity * time^2

Substituting the given values into the formulas, we can calculate the potential energy.

Step 1: Calculate the height: Using the formula for height, we have:

Height = (1/2) * 9.8 m/s^2 * (3 s)^2

Calculating this, we get:

Height = 44.1 meters

Step 2: Calculate the potential energy: Using the formula for potential energy, we have:

Potential Energy = 0.01 kg * 9.8 m/s^2 * 44.1 m

Calculating this, we get:

Potential Energy = 4.3138 Joules

Therefore, the potential energy of the object at the beginning of the fall is approximately 4.3138 Joules.