Two particles 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

Options

A. a vertical line
B. a parabola
C. a hyperbola
D. a straight line making a constant angle `(ne 90^(@))` with horizontal

Answer

D