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Q.

A hanging mass  M is connected to a four times bigger mass by using a string-pulley arrangement as  shown in the figure. The bigger mass is placed on a horizontal ice-slab and being pulled by 2mg force. In this situation tension in the string is  x5Mg for x=  (Neglect mass of the string and friction of  the block (bigger mass) with ice slab.)(given  g= acceleration due to gravity)

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answer is 6.

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Detailed Solution

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For the 4M Kg block :

2Mg-T=4Ma

For the M kg block : 

T-Mg = Ma

Solving the above equations for T :

T=6Mg5

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