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26 September, 14:29

A vector has components x = - 2 m and y = - 2 m. what is its direction (angle with respect to east) ?

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  1. 26 September, 17:48
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    Since both components are negative, so the vector lies on the 3rd quadrant.

    Calculate for angle using tanθ:

    tanθ = y / x

    θ = tan^-1 (-2 / - 2)

    θ = 45°

    Since this is in 3rd quadrant, therefore when reference with respect to east or 1st quadrant, the angle is:

    θ = 180 + 45 = 225° from the east (counter clockwise)

    θ = 90 + 45 = 135° from the east (clockwise)
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