Let → a = k ˆ 2 j ˆ i ˆ + + , → b = k ˆ 2 j ˆ b i ˆ b 2 1 + + and → c = k ˆ 2 j ˆ i ˆ 5 + + be three vectors such that the projection vector of → b on → a is → a . If → a + → b is perpendicular to → c , then | → b | is equal to :

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Let → a = k ˆ 2 j ˆ i ˆ + + , → b = k ˆ 2 j ˆ b i ˆ b 2 1 + + and → c = k ˆ 2 j ˆ i ˆ 5 + + be three vectors such that the projection vector of → b on → a is → a . If → a + → b is perpendicular to → c , then | → b | is equal to :

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