A captive James Bond is strapped to a table beneath a huge pendulum made of a 2.0-m-diameter uniform circular metal blade rigidly attached, at its top edge, to a 6.0-m-long, massless rod.
The pendulum is set swinging with a 10° amplitude when its lower edge is 3.0 m above the prisoner, then the table slowly starts ascending at 1.0 mm/s. After 25 minutes, the pendulum’s amplitude has decreased to 7.0°. Fortunately, the prisoner is freed with a mere 30 s to spare. What was the speed of the lower edge of the blade as it passed over him for the last time?