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Q.

Adding î + 77ĵ and 7î + ĵ gives ______

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a

$78 î + 8 \hat{j}$

b

$8 î + 78 \hat{j}$

c

$î + 74 \hat{j}$

d

$0 î + 76 \hat{j}$

answer is A.

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Detailed Solution

When î + 77ĵ is added to 7î + ĵ, the corresponding components get added.

Hence, the resultant is 8î + 78ĵ.

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