Question

A vector is represented by P = 3i + i + 2k. What
is its length in the XY plane?
(a) 2
(b) √5
(c) √10
(d) √15​

Answer 1

Answer:

$(c) \: \sqrt{10}$

Explanation:

3i + j + 2k

In xy plane length =

$\sqrt{ {3}^{2} + {1}^{2} }$

$= \sqrt{10}$