Question

two physical quantites a and b have diffrent dimensions which mathmetical operation given below is possible

1-√ab
2-a(1+b)
3-(a-b)
4-(a+b)

Answer 1

option A as different dimensions can only be multiplied or divided but not added together. ( you can't add 20m/s to 30 kgs but you can multiply them to get 600kgm/s (momentum))