Motion and Force doubt

Question

When I calculating resultant force in equilateral triangle why there is square root vector formula we will put?

Answer 1

We use that formula because it is the Pythagorean Theorem, applied to the particular situation.

 

The horizontal and vertical components form the two legs of a right triangle and the hypotenuse is the resultant.

 

So, if we take the square root of the sum of squares of the x and y components, we end up with the resultant (force or distance or whatever your vectors are).

 

I hope this helps!

Answer 2

Your question is very confusing-because the English is unclear, and in addition, the description of the problem seems to be lacking some details.