Two particles A and B, move with constant velocities v1 and v2 respectively. At the initial moment, their position vectors are r1 and r2 respectively. The condition for particles A and B for their collision will be 1. r 1 − r 2 | r 1 − r 2 | = v 2 − v 1 | v 2 − v 1 | r1-r2r1-r2=v2-v1v2-v1 2. r 1 ⋅ v 1 = r 2 ⋅ v 2 r1·v1=r2·v2 3. r 1 × v 1 = r 2 × v 2 r1×v1=r2×v2 4. r 1 − r 2 = v 1 − v 2 r1-r2=v1-v2

 

  Question:  From NCERT  | NEET PYQ   || [Difficult level:Easy]  |Motion In A Plane| 

Two particles A and B, move with constant velocities v1 and v2 respectively. At the initial moment, their position vectors are r1 and r2 respectively. The condition for particles A and B for their collision will be

1. $\frac{r_1-r_2}{\left|}=\frac{v_2-v_1}{\left|}$

2. $r_1\cdot v_1=r_2\cdot v_2$

3. $r_1\times v_1=r_2\times v_2$

4. $r_1-r_2=v_1-v_2$

r1-r2=v1-v2_

: 1. 

$\frac{r_1-r_2}{\left|}=\frac{v_2-v_1}{\left|}$

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NCERT REFERENCE

CLASS 11 | Physics |CHAPTER 4 | Motion In A Plane

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