A particle of mass m moving with a speed v hits elastically another stationary particle of mass 2m on a smooth horizontal circular tube of radius r. The time in which the next collision will take place is equal to

A particle of mass m moving with a speed v hits elastically another st

1.	A particle of mass m moving with a speed v hits elastically another stationary particle of mass 2m on a smooth horizontal circular tube of radius r. The time in which the next collision will take place is equal to
Answer» `(pi R)/(V)` `(2PI)/(v)` `(pi r)/(2v)` `(pi)/(4V)` Answer :B