the question is under chapter rotational motion ( angular momentum and angular acceleration)

3) A solid cylinder has mass of 3.0 kg spins with a speed of 1700 revolution per minute. Given the radius of the cross-sectional area is 25.0 cm and I = 1/2MR2. Calculate: (i) the angular momentum of the cylindrical roller [4 marks] (ii) the angular acceleration and torque to stop the cylindrical roller in 6.0 s. [4 marks]