Answer:
Angle must be greater than 90 to make one or more components of a vector negative.
Explanation:
There are four ranges of angle given below:
 (i) For 0 < θ < 90, both components are positive.
 (ii) For 90 < θ < 180, x-component is negative while y-component is positive.
 (iii) For 180 < θ < 270, both components are negative.
 (iv) For 270 < θ < 360, x-component is positive while y-component is negative.
Hence, angle must be greater than 90 to make one or more components of a vector negative.