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Vector vec(A) is 2cm long and is 60^(@) ...

Vector `vec(A)` is 2`cm` long and is `60^(@)` above the x-axis in the first quadrant. Vector `vec(B)` is `2 cm` long and is `60^(@)` below the x-axis in the fourth quadrant. The sum `vec(A)+vec(B)` is a vector of magnitudes

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`vec(R) = vec(A) + vec(B)`
`vec(R) = 2 cos 60^(@) hat(i) + 2 sin 60hat(j) + 2 cos 60 hat(i) - 2 sin 60 hat(j)`
`vec(R) = 4 cos 60 hat(i) = 2hat(i)`
`therefore 2cm`, along x-axis
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