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?
Select all that apply

Question

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?

Select all that apply

G1 Physics · Accepted Answer

Both particles have the same gravitational acceleration, so their relative acceleration is zero. Therefore the relative velocity is constant and r⃗ = v⃗(rel)t. Thus |r⃗| increases linearly with time and its direction remains fixed, which is statement C. Since the question asks for the incorrect statements, A, B and D are incorrect. The printed source key marks C, but C is actually the correct statement for the printed question.