Two particle are projected simultaneously in the same vertical plane from the same point, with d...

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Two particle are projected simultaneously in the same vertical plane from the same point, with different speeds \( u_{1} \) and \( u_{2} \), making angles \( \theta_{1} \) and \( \theta_{2} \) respectively with the horizontal, such that \( u_{1} \cos \theta_{1}=u_{2} \cos \theta_{2} \). The path followed by one, as seen by the other (as long as both are in flight) is :
(A) A horizontal straight line
(B) A vertical straight line
(C) A parabola
(D) A straight line making an angle \( \left|\theta_{1}-\theta_{2}\right| \) with the horizontal.
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