Force \( F \) is applied on upper pulley. If \( F=30 t N \) where \...

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Force \( F \) is applied on upper pulley. If \( F=30 t N \) where
\( \mathrm{P} \) \( t \) is time in second. Find the time when \( m_{1} \) loses contact with floor.
W
(1) \( t=1 \mathrm{sec} \).
(2) \( t=2 \mathrm{sec} \).
(3) \( t=0.5 \mathrm{sec} \).
(4) \( t=1.5 \mathrm{sec} \).
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