20N, 45°E
20N, 45°W
10√2N, 45°W
10√2N, 45°E
Correct answer is D
From Pythagoras,
R2 = 102 + 102
= 100 + 100
= 200
therefore R2 = √200 = √2 x 100
= 10√2, in the direction 45°E
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