Find $| \mathrm { v } |$ And $| \mathbf { u } + \mathbf {v} |$

Essay

Find $| \mathrm { v } |$
and $| \mathbf { u } + \mathbf {v} |$
, given that $\mathbf { u } = 2 \mathbf { i } - \mathbf { j }$
and $\mathbf { v } = \mathbf { i }$
.