Question

Given that A has dimensions of length and B has dimensions of mass. Which mathematical operation given below is physically meaningful?

• A. A/B
• B. A + B
• C. A − B
• D. None

Answer 1

The correct option is A A/B

Quantities having different dimensions can only be divided or multiplied but they cannot be added or subtracted. e.g., Distance and time can't be added but they can be divided to give the speed.