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physics (please help elena)

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We will now examine how much time we need to stop a ship-engine-like cylinder. Suppose you take a rotating cylinder and let it roll to the right until it reaches a vertical wall. It then spins against the two walls as shown in the picture, slowly slowing down. How much time will it take in s for the cylinder to stop? The initial velocity of cylinder's surface when it touches the vertical wall is 30 m/s.
Its length is l=10 m, its radius is r=0.5 m and it's made out of wood of density ρ=800 kg/m3.
The coefficient of friction between the cylinder and the walls is μ=0.3.

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