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  4. 2-31 In the shown mass pulley system, pulleys and string are massless. The one end of the string is pulled by the force F=m g. The acceleration of the block will be :

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Q. 2-31 In the shown mass pulley system, pulleys and string are massless. The one end of the string is pulled by the force $F=m g$. The acceleration of the block will be :Physics Question Image

Laws of Motion

Solution:

image
$2 F-m g =m a $
$2 m g-m g =m a $
$ m a =m g $
$ a =g$