Two Vectors Lie with Their Tails at the Same Point

question 22

Multiple Choice

Two vectors lie with their tails at the same point.When the angle between them is increased by 20° their scalar product has the same magnitude but changes from positive to negative.The original angle between them was:

• A)0°
• B)60°
• C)70°
• D)80°
• E)90°

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Definitions:

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