A pendulum of mass 4 kg, length 2 m and an air resistance coefficient of 5 Nsm^–1 is released from an initial position in which it makes an angle of 20° with the vertical. Assuming that this angle is small enough for the small-angle approximation to be made in the equation of motion, how many oscillations will be obviously observable before the pendulum comes to rest, and how long will it take for the amplitude of the motion to have fallen to less than 1°?