MathematicsHard202×since 2002Q5771Let a→=i^+j^+2k^,\overrightarrow a = \widehat i + \widehat j + \sqrt 2 \widehat k,a=i+j+2k, b→=b1i^+b2j^+2k^\overrightarrow b = {b_1}\widehat i + {b_2}\widehat j + \sqrt 2 \widehat kb=b1i+b2j+2k, c→=5i^+j^+2k^\overrightarrow c = 5\widehat i + \widehat j + \sqrt 2 \widehat kc=5i+j+2k be three vectors such that the projection vector of b→\overrightarrow bb on a→\overrightarrow aa is a→\overrightarrow aa. If a→+b→\overrightarrow a + \overrightarrow ba+b is perpendicular to c→\overrightarrow cc , then ∣b→∣\left| {\overrightarrow b } \right|b is equal to :A32\sqrt {32}32B6C22\sqrt {22}22D4Check answerSkip