A thin metal disc of radius 0.25 m and mass 2 kg starts from rest and rolls down an Inclined plane. If its rotational kinetic energy is 4 J at the foot of the inclined plane, then its linear velocity at the same point is:

A wheel has a speed of 1200 revolution per minute and is made to slow down at a rate of 4 radian/sec². The number of revolutions it makes before coming to rest is :