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  4. A system to 10 balls each of mass 2 kg are connected via massless and unstretchable string. The system is allowed to slip over the edge of a smooth table as shown in figure. Tension on the string between the 7 text th and 8 text th ball is N when 6 text th ball just leaves the table.

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Q. A system to $10$ balls each of mass $2\, kg$ are connected via massless and unstretchable string. The system is allowed to slip over the edge of a smooth table as shown in figure. Tension on the string between the $7^{\text {th }}$ and $8^{\text {th }}$ ball is ____$N$ when $6^{\text {th }}$ ball just leaves the table.Physics Question Image

JEE MainJEE Main 2022Laws of Motion

Solution:

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$a =\frac{6 mg }{10 m }=\frac{6 g }{10}=\frac{3 g }{5}$
taking $8,9,10$ together
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$T =3\, ma$
$=3 m \times \frac{3 g }{5}$
$=36\, N$