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A cylindrical barrel of mass 2 kg and radius 0.2 m (moment of inertia, / = 0.04 kgm²) isset rolling in a straight line along a flat horizontal track and travels at an initial translational velocity of v₁ = 1.0 ms ¹. The barrel remains in contact with the track as it rotates, without slipping. Due to constant frictional forces, the rotation of the barrel is completely stopped in a time of 10 seconds i. Calculate the initial angular velocity of the rolling barrel. ii.Calculate the angular deceleration of the barrel.

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