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  4. Two blocks of masses 2 kg and 4 kg are attached by an inextensible light string as shown in the figure. If a force of 120 N pulls the blocks vertically upward, the tension in the string is (take g = 10 ms-2)

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Q. Two blocks of masses $2\,kg$ and $4\,kg$ are attached by an inextensible light string as shown in the figure. If a force of $120\,N$ pulls the blocks vertically upward, the tension in the string is
(take $g = 10\, ms^{-2}$)Physics Question Image

KEAMKEAM 2014Laws of Motion

Solution:

image
$F=m a $
$120 =(4+2) \times a $
$ a =\frac{120}{6}=20 \,m / s ^{2}$
The tension in the string
$T =F=m a$
$ =2 \times 20=40\, N$