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  4. In figure shown, both blocks are released from rest. The time to cross each other is:

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Q. In figure shown, both blocks are released from rest. The time to cross each other is:Physics Question Image

Laws of Motion

Solution:

$a=\frac{4 g-g}{4+1}=\frac{3 g}{5}$
$s _{ rel }=6 m$
$a_{ rel }=\frac{6 g }{5}=12 m / s ^{2}$
$t =\sqrt{\frac{2 s _{ rel }}{ a _{ rel }}}=1 s$