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Q.

A block A of mass M1 is connected to another block of mass M2 by a massless string through a spring of force constant k as shown in figure. The coefficient of friction between the block A and the table is μ. The pulley is frictionless. When the block B is moving downward, the tension in the string is independent of:

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a

mass M1

b

Coefficient of friction μ

c

mass M2

d

Spring constant k

answer is C.

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Detailed Solution

M2g-T=M2a

and T-μM1g=M1a

On solving, we get

a=M2g-μM1gM1+M2, and so on

T will be free from force constant of spring k.

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