Four seconds after a polisher is started from rest, small tufts of fleece from along the circumference of the 10-in.-diameter polishing pad are observed to fly free of the pad. If the polisher is started so that the fleece along the circumference undergoes a constant tangential acceleration of 12 ft/s², determine

(a) The speed v of a tuft as it leaves the pad,

(b) The magnitude of the force required to free the tuft if the average weight of a tuft is 60 × 10^ˆ’6 oz.