A long steel wire of length 'L' is suspended from the ceiling of a room. A sphere of mass 'm' and radius 'r' is attached to the lower end of the wire. The height of the ceiling is `(L+2r^1 +1)` . When the sphere is made to oscillate as a pendulum, its lowest point just touches the floor. The velocity of the sphere at the lowest point will be (L > > `r^1` , 1 and r is the radius of the wire)

Options

A. `sqrt((pi r^2 ye)/(m) - Lg)`
B. `sqrt((pir^2y)/(me) - Lg)`
C. `sqrt((ypi r^2 e)/(m))`
D. none

Answer

A