Some courses provide students with quizzes and answers. I can't understand the answer below. Let me type a question first and then a strange answer.

Q: What are the SI units of power?

A: The SI units of power are equal to the SI units of energy divided by the SI units of time, s. The SI units of energy are the product of the SI units of force, kg-m/s2 , and the SI units of distance, m. Therefore the SI units of energy are kg-m2/s2. Hence the SI units of power are kg-m2/s3.

What I did not catch is why distance is denoted by letter 'm'. What's that really, mass or distance?

Many thx

Question

Some courses provide students with quizzes and answers. I can't understand the answer below. Let me type a question first and then a strange answer. 

Q: What are the SI units of power?

A: The SI units of power are equal to the SI units of energy divided by the SI units of time, s. The SI units of energy are the product of the SI units of force, kg-m/s2 , and the SI units of distance, m. Therefore the SI units of energy are kg-m2/s2. Hence the SI units of power are kg-m2/s3.

What I did not catch is why distance is denoted by letter 'm'. What's that really, mass or distance?

Many thx

fifciol · Answer

It's the distance, m simply means meter in SI units. It's not the dimensional analysis when you use m as a mass