A simple pendulum is hanging from a peginserted in a vertical wall. Its bob is strteched to horizontal position form wall and left freee to move, the bob hits the wall. If coefficient of restitution is `(2)/(sqrt(5))`. After how many collisions the amplitude of vibration will becomes less then `60^(@)`.

Options

A. 6
B. 3
C. 4
D. 5