Two particles move with constant velocities in a plane. Initially B relative to A has position $\vec{r}$ ₀ and velocity $\overrightarrow{V}_{r}$ Which statements are correct?
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Question

Two particles move with constant velocities in a plane. Initially B relative to A has position r ⃗ \vec{r} r ₀ and velocity V → r \overrightarrow{V}_{r} V r ​ Which statements are correct?

G1 Physics · Accepted Answer

For constant relative velocity, collision requires the relative-motion line to pass through the origin and be directed toward it. Orthogonality r⃗₀·v⃗_r=0 gives zero instantaneous radial relative speed, i.e. stationary separation.

Two particles move with constant velocities in a plane. Initially B relative to A has position r ⃗ \vec{r} r ₀ and velocity V → r \overrightarrow{V}_{r} V r ​ Which statements are correct?

Two particles move with constant velocities in a plane. Initially B relative to A has position r ⃗ \vec{r} r ₀ and velocity V → r \overrightarrow{V}_{r} V r Which statements are correct?