The hook moves from rest with an acceleration of $1\mathrm{0m/s}\frac{}{\mathrm{}}².$ If it is attached to a cord which is wound around the drum, determine angular acceleration of the drum and its angular velocity after the drum has completed $10$rev. How many more revolutions will the drum tum after it has completed $10$ rev and the hook continues to move downwards for $4$ s$?$