Question

Is the box moving at a constant speed? Explain how you know. What does this tell you about the kinetic energy of the system

Answer 1

Answer:

The box is moved at constant speed, then the change in kinetic energy is zero.

Explanation:

Let suppose that box moves at constant speed, meaning that its kinetic energy ($K$), measured in joules, is expressed by the following equation:

$K = \frac{1}{2}\cdot m\cdot v^{2}$ (1)

Where:

$m$ - Mass, measured in kilograms.

$v$ - Speed, measured in meters per second.

If the box moves at constant speed, then we notice that $v_{f}^{2}-v_{o}^{2} = 0$, therefore, $\Delta K = 0$. In a nutshell, if the box is moved at constant speed, then the change in kinetic energy is zero.