Problem

Two particles

A

and

B

are placed in gravity free space at

(0, 0, 0)

m and

(30, 0, 0)

m respectively. Particle

A

is projected with a velocity

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

, while particle

B

is projected with a velocity

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

simultaneously. Then, a. they will collide at

(10, 20, 10)

m b. they will collide at

(10, 10, 10)

m c. they will never collide d. they will collide at 2 s