Question

can anyone plz solve this..

Answer 1

unit vector along A is (2i-j+k)/magnitude
$|magnitude| = \sqrt{2 {}^{2} + ( - 1) {}^{2} + 1 {}^{2} }$
unit vector =
$(2i - j + k) \div \sqrt{6}$
vector B= 5 * unit vector=
$5 \times (2i - j + k) \div \sqrt{6}$