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@Vincent-Lyon.Fr
since we have a frictionless pulley, the vertical force on the string the holds block B is equal to the force of the string the holds the cylinder in inclined plane...
right..
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T-mg=ma..............(1) a be the upward acceleration m=mass of the block M = mass of the cylinder r= radius of the cylinder f+Mgsin30-T=Ma......................(2) fr+Tr=(1/2Mr^2)a/r f+T=1/2Ma...........(3)
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