Two particles are projected from the same point with the same speed in the same vertical plane a...

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Two particles are projected from the same point with the same speed in the same vertical plane at different angles with the horizontal. A frame of reference is fixed to one particle. The position vector of the other particle as observed from the frame is \( \vec{r} \). Which of the following statements is/are incorrect?
(a) \( \vec{r} \) is a constant vector
(b) \( \vec{r} \) changes in magnitude and direction with time
(c) the magnitude of \( \vec{r} \) increases linearly with time, its direction does not change
- (d) the direction of \( \vec{r} \) changes with time, its magnitude may or may not change depending on the angles of projection.
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