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Q.

A smooth plank of mass 1 kg and length 8cm is on smooth horizontal surface. The gap between fixed pulley p and plank is larger than the length of plank. A smooth block D is placed on the right edge of the plank. The masses of blocks A and B are 1 kg and 3 kg , respectively. Find the time elapsed before the block D separates from the plank

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a

0.2s

b

0.3s

c

0.1s

d

2s

answer is B.

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Detailed Solution

$a = \frac{(m_{B} - m_{A}) g}{m_{A} + m_{B} + m_{E}} 8 = \frac{1}{2} a t^{2} s o l v e t$

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A smooth plank of mass 1 kg and length 8cm is on smooth horizontal surface. The gap between fixed pulley p and plank is larger than the length of plank. A smooth block D is placed on the right edge of the plank. The masses of blocks A and B are 1 kg and 3 kg , respectively. Find the time elapsed before the block D separates from the plank