Question

Маленька куля, яка почала падати з висоти 10 м, мала потенціальну енергію 4 Дж. Чому дорівнює кінетична енергія цієї кульки в той час, коли вона торкнулась землі? Опором повітря знехтувати. ОТВЕТЬТЕ ДАЮ 40 БАЛЛОВ

Answer 1

Ответ:

4 Дж, Кинетическая энергия обратно пропорциональна потенциальной

Answer 2

To calculate the kinetic energy of the ball when it touches the ground, we need to use the principle of conservation of energy. According to this principle, the total mechanical energy of a system remains constant if no external forces are acting on it.

In this case, the ball starts falling from a height of 10 m and has a potential energy of 4 J. When it touches the ground, all of its potential energy is converted into kinetic energy.

Conservation of Energy Equation:

The conservation of energy equation can be written as:

Potential Energy (PE) + Kinetic Energy (KE) = Total Mechanical Energy (TME)

Since the ball has no initial kinetic energy, the equation becomes:

PE = KE + TME

Calculation:

Given that the potential energy of the ball is 4 J, we can substitute this value into the equation:

4 J = KE + TME

Since the ball has no initial kinetic energy, the total mechanical energy is equal to the potential energy:

TME = PE = 4 J

Therefore, the equation becomes:

4 J = KE + 4 J

Simplifying the equation, we find that the kinetic energy of the ball when it touches the ground is:

KE = 0 J

This means that the kinetic energy of the ball is zero when it touches the ground.

Please let me know if you need any further clarification or assistance!