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

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 (), measured in joules, is expressed by the following equation:

(1)

Where:

- Mass, measured in kilograms.

- Speed, measured in meters per second.

If the box moves at constant speed, then we notice that , therefore, . In a nutshell, if the box is moved at constant speed, then the change in kinetic energy is zero.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s