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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^@` with the vertical

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The correct Answer is:
C
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