Question

A particle of mass m moving with a speed v hits elastically another stationary particle of ,ass 2 m in a fixed smooth horizontal circular tube of radius r. find the time when the next collision will take place?

• A. $t=\frac{2\pi r}{v}$
• B. $t=\frac{\pi r}{2v}$
• C. $t=\frac{\pi r}{v}$
• D. $t=\frac{3\pi r}{v}$

Answer 1

The correct option is A $t=\frac{2\pi r}{v}$