Two blocks of masses 
and 
, are placed on a frictionless table as shown in figure. A massless spring with spring constant k is attached with the lower block. If the system is slightly displaced and released, then ( 
coefficient of friction between the two blocks)
B, C, D Only
( 
displacement of the blocks from the mean position) C, D, E Only 
A, B, D Only
(E) Maximum frictional force can be
. Choose the correct answer from the options given below: A, B, C Only
Text Solution
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As both blocks moving together so
Time period 
; where 
Let block is displaced by x in (+ve) direction so force on block will be in(-ve) direction
As upper block is moving due to friction thus
This option is like two block problem in friction for maximum amplitude, force on block is also maximum, for which both blocks are
(E) Maximum friction can be 
as force is acting between blocks & normal force here is mg
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