Question

Given that A=2i-3j+6k and B=i-2j+2k.find the scalar projection of B onto A

Answer 1

The scalar projection of B onto A $=(\vec a\cdot\vec b)/|\vec a|=$

$=(2\cdot1+(-3)\cdot(-2)+6\cdot2)/\sqrt{2^2+3^2+6^2}=$

$=20/7=2.86$ . Answer