Two particles and are placed in gravity-free space at and

PHYSICS · Single correct · CBSE · Physics · Motion in a Plane · Motion in a Plane

Problem

Two particles

A

and

B

are placed in gravity-free space at

(0,0,0)\ \text{m}

and

(30,0,0)\ \text{m}

, respectively. Particle

A

is projected with velocity

(5\hat{i}+10\hat{j}+5\hat{k})\ \text{m s}^{-1}

, while particle

B

is projected simultaneously with velocity

(10\hat{i}+5\hat{j}+5\hat{k})\ \text{m s}^{-1}

. Then, (1) They collide at

(10,20,10)\ \text{m}

. (2) They collide at

(10,10,10)\ \text{m}

. (3) They never collide. (4) They collide at

2\ \text{s}