Which particle have a mass of 1 u​

Explanation:

proton

https://study.com/academy/answer/which-of-the-three-major-subatomic-particles-has-have-a-mass-of-approximately-1-u-i-e-ii-p-plus-iii-n0-a-i-only-b-ii-only-c-iii-only-d-i-and-ii-e-ii-and-iii.html

here hope this helps if wrong you can report

Explanation:

the components of a vector are the parts of the vectors that are to each other.

b perpendicular