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Force ‘F’is applied on upper pulley. If F = 30t where ‘t’is time in second. Find the time when m1 loses contact with floor.

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Force ‘F’is applied on upper pulley. If F = 30t where ‘t’is time in second. Find the time when m1 loses contact with floor.

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From force diagram of pulley:

F = 3T

30t = 3T

∴T = 10 t

For lossing contact,

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