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Question

Vector A is 2 cm long and is 60 above the +ve X axis. Vector A is 2 cm long and is 60 below the x - axis in the fourth quadrant. The value of A + B is


A

2 cm along -x axis

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B

2 cm along +x axis

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C

4 cm along -x axis

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D

4 cm along +x axis

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Solution

The correct option is B

2 cm along +x axis


R = A + B

R = 2 cos 60 ^i + 2 sin 60 ^j + 2 cos 60 ^i - 2 sin 60 ^j

R = 4 cos 60 ^i


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