Force F is applied on upper pulley. If F = 30 t, where t is time in second. Find the time (in sec) when m1 loses contact with floor. (Take g = 10 m/s2)

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answer is 2.

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Detailed Solution

Block B loses contact when normal reaction on it becomes zeroi.e., 2T=40T=20NF=3T30t=3(20)30t=60t=2s

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