A sphere of radius 0.1 mand mass `8 pi `kg is attached to the lower end of a steel wire of length 5 mand diamet `10^(@)`m. The wire is suspended from 5.22 m high ceiling of a room. When sphere is made to swing, it just graz the floor at its lowest point, due to the clongation Y for stoel is `2 xx 10^(11)' N//m^(2)',g=10 m//s^(2)`

The velocity of the sphere when it is at lowest point. (Approximately)

Options

A. `sqrt(12.8) ` m/s
B. `sqrt(75.3)` m/s
C. `sqrt(114.08)` m/s
D. `sqrt(51.2)` m/s

Answer

B