Five identical balls each of mass m and radius r are string like beads at random and at rest along a smooth rigid horizontal thin rod of length L mounted between immovable supports Assume `10rleL` and that the collision between balls or between balls and supports are elastic if one ball is struck horizontally so as to acquire a speed v the average force felt by the support is

Options

A. `(5mv^(2))/(L-5r)`
B. `(mv^(2))/(L-10r)`
C. `(5mv^(2))/(L-10r)`
D. `(mv^(2))/(L-5r)`