Two balls are projected simultaneously in the same vertical plane f...

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Two balls are projected simultaneously in the same vertical plane from the same point with velocities \( v_{1} \) and \( v_{2} \) with angle \( \theta_{1} \) and \( \theta_{2} \) respectively with the horizontal. If \( v_{1} \cos \) \( \theta_{1}=v_{2} \cos \theta_{2} \), the path of one ball as seen from the position of other ball is :
(a) parabola
(b) horizontal straight line
(c) vertical straight line
(d) straight line making \( 45^{\circ} \) with the vertical
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