Two particles are projected simultaneously in the same vertical plane, with speed `u_(1)` and `u_(2)` at angle of projection `theta_(1)` and `theta_(2)` respectively with the horizontal. The path followed by one, as seen by 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 with the horizontal

Answer

D