Question

A mass m moves with a velocity v and collides in elastically with another identical mass. After collision first mass moves with velocity v/√3 in a direction perpendicular to the initial direction of motion. Find the speed of second mass after collision.

• A. v
• B. √3 v
• C. 2v/√3
• D. v/√3

Answer 1

Answer: (C)

2v/√3

Answer 2

mv = mv' cos θ, 0 = (mv/√3) – mv' sin θ

or v^-2[cos²θ + sin²θ] = v² + (v²/3)or v' = (2v²/√3)