Question

How do you compute the dot product to find the magnitude of `u=20i+25j`?

Answer 1

You do not use the dot-product, to compute the magnitude; you use `|u| = sqrt(20^2 + 25^2)`

`|u| = sqrt1025`

Explanation:

`|u| = sqrt(20^2 + 25^2)`

`|u| = sqrt(400 + 625)`

`|u| = sqrt1025`