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Question

Two particles are projected simultaneously in the same vertical plane, from the same point, both with different speeds and at different angles with horizontal. The path followed by one, as seen by the other, is

A
a vertical line
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B
a parabola
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C
a hyperbola
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D
a straight line making a constant angle ( 90) with horizontal
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Solution

The correct option is D a straight line making a constant angle ( 90) with horizontal
Let u1 and u2 be the initial velocities of the two particles and θ1 and θ2 be their angles of projection with the horizontal.
The velocities of the two particles after time t are,
v1= (u1cosθ1)^i +(u1sinθ1-gt)^j

v2= (u2cosθ2)^i + (u2sinθ2-gt)^j

v12= v1 -v2= (u1cosθu2cosθ2)^i +(u1sinθ1-gt - u2sinθ2+ gt)^j

v12= v1 -v2= (u1cosθu2cosθ2)^i +(u1sinθ1 - u2sinθ2)^j

which is a constant. So the path followed by one, as seen by the other is straight line, making a constant angle with the horizontal.

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